drivers/gpu/drm/i915/intel_pm.c

   1 /*
   2  * Copyright © 2012 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eugeni Dodonov <eugeni.dodonov@intel.com>
  25  *
  26  */
  27
  28 #include <linux/cpufreq.h>
  29 #include "i915_drv.h"
  30 #include "intel_drv.h"
  31 #include "../../../platform/x86/intel_ips.h"
  32 #include <linux/module.h>
  33 #include <drm/i915_powerwell.h>
  34
  35 /* FBC, or Frame Buffer Compression, is a technique employed to compress the
  36  * framebuffer contents in-memory, aiming at reducing the required bandwidth
  37  * during in-memory transfers and, therefore, reduce the power packet.
  38  *
  39  * The benefits of FBC are mostly visible with solid backgrounds and
  40  * variation-less patterns.
  41  *
  42  * FBC-related functionality can be enabled by the means of the
  43  * i915.i915_enable_fbc parameter
  44  */
  45
  46 static void i8xx_disable_fbc(struct drm_device *dev)
  47 {
  48         struct drm_i915_private *dev_priv = dev->dev_private;
  49         u32 fbc_ctl;
  50
  51         /* Disable compression */
  52         fbc_ctl = I915_READ(FBC_CONTROL);
  53         if ((fbc_ctl & FBC_CTL_EN) == 0)
  54                 return;
  55
  56         fbc_ctl &= ~FBC_CTL_EN;
  57         I915_WRITE(FBC_CONTROL, fbc_ctl);
  58
  59         /* Wait for compressing bit to clear */
  60         if (wait_for((I915_READ(FBC_STATUS) & FBC_STAT_COMPRESSING) == 0, 10)) {
  61                 DRM_DEBUG_KMS("FBC idle timed out\n");
  62                 return;
  63         }
  64
  65         DRM_DEBUG_KMS("disabled FBC\n");
  66 }
  67
  68 static void i8xx_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
  69 {
  70         struct drm_device *dev = crtc->dev;
  71         struct drm_i915_private *dev_priv = dev->dev_private;
  72         struct drm_framebuffer *fb = crtc->fb;
  73         struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
  74         struct drm_i915_gem_object *obj = intel_fb->obj;
  75         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
  76         int cfb_pitch;
  77         int plane, i;
  78         u32 fbc_ctl, fbc_ctl2;
  79
  80         cfb_pitch = dev_priv->fbc.size / FBC_LL_SIZE;
  81         if (fb->pitches[0] < cfb_pitch)
  82                 cfb_pitch = fb->pitches[0];
  83
  84         /* FBC_CTL wants 64B units */
  85         cfb_pitch = (cfb_pitch / 64) - 1;
  86         plane = intel_crtc->plane == 0 ? FBC_CTL_PLANEA : FBC_CTL_PLANEB;
  87
  88         /* Clear old tags */
  89         for (i = 0; i < (FBC_LL_SIZE / 32) + 1; i++)
  90                 I915_WRITE(FBC_TAG + (i * 4), 0);
  91
  92         /* Set it up... */
  93         fbc_ctl2 = FBC_CTL_FENCE_DBL | FBC_CTL_IDLE_IMM | FBC_CTL_CPU_FENCE;
  94         fbc_ctl2 |= plane;
  95         I915_WRITE(FBC_CONTROL2, fbc_ctl2);
  96         I915_WRITE(FBC_FENCE_OFF, crtc->y);
  97
  98         /* enable it... */
  99         fbc_ctl = FBC_CTL_EN | FBC_CTL_PERIODIC;
 100         if (IS_I945GM(dev))
 101                 fbc_ctl |= FBC_CTL_C3_IDLE; /* 945 needs special SR handling */
 102         fbc_ctl |= (cfb_pitch & 0xff) << FBC_CTL_STRIDE_SHIFT;
 103         fbc_ctl |= (interval & 0x2fff) << FBC_CTL_INTERVAL_SHIFT;
 104         fbc_ctl |= obj->fence_reg;
 105         I915_WRITE(FBC_CONTROL, fbc_ctl);
 106
 107         DRM_DEBUG_KMS("enabled FBC, pitch %d, yoff %d, plane %c, ",
 108                       cfb_pitch, crtc->y, plane_name(intel_crtc->plane));
 109 }
 110
 111 static bool i8xx_fbc_enabled(struct drm_device *dev)
 112 {
 113         struct drm_i915_private *dev_priv = dev->dev_private;
 114
 115         return I915_READ(FBC_CONTROL) & FBC_CTL_EN;
 116 }
 117
 118 static void g4x_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
 119 {
 120         struct drm_device *dev = crtc->dev;
 121         struct drm_i915_private *dev_priv = dev->dev_private;
 122         struct drm_framebuffer *fb = crtc->fb;
 123         struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
 124         struct drm_i915_gem_object *obj = intel_fb->obj;
 125         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 126         int plane = intel_crtc->plane == 0 ? DPFC_CTL_PLANEA : DPFC_CTL_PLANEB;
 127         unsigned long stall_watermark = 200;
 128         u32 dpfc_ctl;
 129
 130         dpfc_ctl = plane | DPFC_SR_EN | DPFC_CTL_LIMIT_1X;
 131         dpfc_ctl |= DPFC_CTL_FENCE_EN | obj->fence_reg;
 132         I915_WRITE(DPFC_CHICKEN, DPFC_HT_MODIFY);
 133
 134         I915_WRITE(DPFC_RECOMP_CTL, DPFC_RECOMP_STALL_EN |
 135                    (stall_watermark << DPFC_RECOMP_STALL_WM_SHIFT) |
 136                    (interval << DPFC_RECOMP_TIMER_COUNT_SHIFT));
 137         I915_WRITE(DPFC_FENCE_YOFF, crtc->y);
 138
 139         /* enable it... */
 140         I915_WRITE(DPFC_CONTROL, I915_READ(DPFC_CONTROL) | DPFC_CTL_EN);
 141
 142         DRM_DEBUG_KMS("enabled fbc on plane %c\n", plane_name(intel_crtc->plane));
 143 }
 144
 145 static void g4x_disable_fbc(struct drm_device *dev)
 146 {
 147         struct drm_i915_private *dev_priv = dev->dev_private;
 148         u32 dpfc_ctl;
 149
 150         /* Disable compression */
 151         dpfc_ctl = I915_READ(DPFC_CONTROL);
 152         if (dpfc_ctl & DPFC_CTL_EN) {
 153                 dpfc_ctl &= ~DPFC_CTL_EN;
 154                 I915_WRITE(DPFC_CONTROL, dpfc_ctl);
 155
 156                 DRM_DEBUG_KMS("disabled FBC\n");
 157         }
 158 }
 159
 160 static bool g4x_fbc_enabled(struct drm_device *dev)
 161 {
 162         struct drm_i915_private *dev_priv = dev->dev_private;
 163
 164         return I915_READ(DPFC_CONTROL) & DPFC_CTL_EN;
 165 }
 166
 167 static void sandybridge_blit_fbc_update(struct drm_device *dev)
 168 {
 169         struct drm_i915_private *dev_priv = dev->dev_private;
 170         u32 blt_ecoskpd;
 171
 172         /* Make sure blitter notifies FBC of writes */
 173         gen6_gt_force_wake_get(dev_priv);
 174         blt_ecoskpd = I915_READ(GEN6_BLITTER_ECOSKPD);
 175         blt_ecoskpd |= GEN6_BLITTER_FBC_NOTIFY <<
 176                 GEN6_BLITTER_LOCK_SHIFT;
 177         I915_WRITE(GEN6_BLITTER_ECOSKPD, blt_ecoskpd);
 178         blt_ecoskpd |= GEN6_BLITTER_FBC_NOTIFY;
 179         I915_WRITE(GEN6_BLITTER_ECOSKPD, blt_ecoskpd);
 180         blt_ecoskpd &= ~(GEN6_BLITTER_FBC_NOTIFY <<
 181                          GEN6_BLITTER_LOCK_SHIFT);
 182         I915_WRITE(GEN6_BLITTER_ECOSKPD, blt_ecoskpd);
 183         POSTING_READ(GEN6_BLITTER_ECOSKPD);
 184         gen6_gt_force_wake_put(dev_priv);
 185 }
 186
 187 static void ironlake_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
 188 {
 189         struct drm_device *dev = crtc->dev;
 190         struct drm_i915_private *dev_priv = dev->dev_private;
 191         struct drm_framebuffer *fb = crtc->fb;
 192         struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
 193         struct drm_i915_gem_object *obj = intel_fb->obj;
 194         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 195         int plane = intel_crtc->plane == 0 ? DPFC_CTL_PLANEA : DPFC_CTL_PLANEB;
 196         unsigned long stall_watermark = 200;
 197         u32 dpfc_ctl;
 198
 199         dpfc_ctl = I915_READ(ILK_DPFC_CONTROL);
 200         dpfc_ctl &= DPFC_RESERVED;
 201         dpfc_ctl |= (plane | DPFC_CTL_LIMIT_1X);
 202         /* Set persistent mode for front-buffer rendering, ala X. */
 203         dpfc_ctl |= DPFC_CTL_PERSISTENT_MODE;
 204         dpfc_ctl |= (DPFC_CTL_FENCE_EN | obj->fence_reg);
 205         I915_WRITE(ILK_DPFC_CHICKEN, DPFC_HT_MODIFY);
 206
 207         I915_WRITE(ILK_DPFC_RECOMP_CTL, DPFC_RECOMP_STALL_EN |
 208                    (stall_watermark << DPFC_RECOMP_STALL_WM_SHIFT) |
 209                    (interval << DPFC_RECOMP_TIMER_COUNT_SHIFT));
 210         I915_WRITE(ILK_DPFC_FENCE_YOFF, crtc->y);
 211         I915_WRITE(ILK_FBC_RT_BASE, i915_gem_obj_ggtt_offset(obj) | ILK_FBC_RT_VALID);
 212         /* enable it... */
 213         I915_WRITE(ILK_DPFC_CONTROL, dpfc_ctl | DPFC_CTL_EN);
 214
 215         if (IS_GEN6(dev)) {
 216                 I915_WRITE(SNB_DPFC_CTL_SA,
 217                            SNB_CPU_FENCE_ENABLE | obj->fence_reg);
 218                 I915_WRITE(DPFC_CPU_FENCE_OFFSET, crtc->y);
 219                 sandybridge_blit_fbc_update(dev);
 220         }
 221
 222         DRM_DEBUG_KMS("enabled fbc on plane %c\n", plane_name(intel_crtc->plane));
 223 }
 224
 225 static void ironlake_disable_fbc(struct drm_device *dev)
 226 {
 227         struct drm_i915_private *dev_priv = dev->dev_private;
 228         u32 dpfc_ctl;
 229
 230         /* Disable compression */
 231         dpfc_ctl = I915_READ(ILK_DPFC_CONTROL);
 232         if (dpfc_ctl & DPFC_CTL_EN) {
 233                 dpfc_ctl &= ~DPFC_CTL_EN;
 234                 I915_WRITE(ILK_DPFC_CONTROL, dpfc_ctl);
 235
 236                 if (IS_IVYBRIDGE(dev))
 237                         /* WaFbcDisableDpfcClockGating:ivb */
 238                         I915_WRITE(ILK_DSPCLK_GATE_D,
 239                                    I915_READ(ILK_DSPCLK_GATE_D) &
 240                                    ~ILK_DPFCUNIT_CLOCK_GATE_DISABLE);
 241
 242                 if (IS_HASWELL(dev))
 243                         /* WaFbcDisableDpfcClockGating:hsw */
 244                         I915_WRITE(HSW_CLKGATE_DISABLE_PART_1,
 245                                    I915_READ(HSW_CLKGATE_DISABLE_PART_1) &
 246                                    ~HSW_DPFC_GATING_DISABLE);
 247
 248                 DRM_DEBUG_KMS("disabled FBC\n");
 249         }
 250 }
 251
 252 static bool ironlake_fbc_enabled(struct drm_device *dev)
 253 {
 254         struct drm_i915_private *dev_priv = dev->dev_private;
 255
 256         return I915_READ(ILK_DPFC_CONTROL) & DPFC_CTL_EN;
 257 }
 258
 259 static void gen7_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
 260 {
 261         struct drm_device *dev = crtc->dev;
 262         struct drm_i915_private *dev_priv = dev->dev_private;
 263         struct drm_framebuffer *fb = crtc->fb;
 264         struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
 265         struct drm_i915_gem_object *obj = intel_fb->obj;
 266         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 267
 268         I915_WRITE(IVB_FBC_RT_BASE, i915_gem_obj_ggtt_offset(obj));
 269
 270         I915_WRITE(ILK_DPFC_CONTROL, DPFC_CTL_EN | DPFC_CTL_LIMIT_1X |
 271                    IVB_DPFC_CTL_FENCE_EN |
 272                    intel_crtc->plane << IVB_DPFC_CTL_PLANE_SHIFT);
 273
 274         if (IS_IVYBRIDGE(dev)) {
 275                 /* WaFbcAsynchFlipDisableFbcQueue:ivb */
 276                 I915_WRITE(ILK_DISPLAY_CHICKEN1, ILK_FBCQ_DIS);
 277                 /* WaFbcDisableDpfcClockGating:ivb */
 278                 I915_WRITE(ILK_DSPCLK_GATE_D,
 279                            I915_READ(ILK_DSPCLK_GATE_D) |
 280                            ILK_DPFCUNIT_CLOCK_GATE_DISABLE);
 281         } else {
 282                 /* WaFbcAsynchFlipDisableFbcQueue:hsw */
 283                 I915_WRITE(HSW_PIPE_SLICE_CHICKEN_1(intel_crtc->pipe),
 284                            HSW_BYPASS_FBC_QUEUE);
 285                 /* WaFbcDisableDpfcClockGating:hsw */
 286                 I915_WRITE(HSW_CLKGATE_DISABLE_PART_1,
 287                            I915_READ(HSW_CLKGATE_DISABLE_PART_1) |
 288                            HSW_DPFC_GATING_DISABLE);
 289         }
 290
 291         I915_WRITE(SNB_DPFC_CTL_SA,
 292                    SNB_CPU_FENCE_ENABLE | obj->fence_reg);
 293         I915_WRITE(DPFC_CPU_FENCE_OFFSET, crtc->y);
 294
 295         sandybridge_blit_fbc_update(dev);
 296
 297         DRM_DEBUG_KMS("enabled fbc on plane %d\n", intel_crtc->plane);
 298 }
 299
 300 bool intel_fbc_enabled(struct drm_device *dev)
 301 {
 302         struct drm_i915_private *dev_priv = dev->dev_private;
 303
 304         if (!dev_priv->display.fbc_enabled)
 305                 return false;
 306
 307         return dev_priv->display.fbc_enabled(dev);
 308 }
 309
 310 static void intel_fbc_work_fn(struct work_struct *__work)
 311 {
 312         struct intel_fbc_work *work =
 313                 container_of(to_delayed_work(__work),
 314                              struct intel_fbc_work, work);
 315         struct drm_device *dev = work->crtc->dev;
 316         struct drm_i915_private *dev_priv = dev->dev_private;
 317
 318         mutex_lock(&dev->struct_mutex);
 319         if (work == dev_priv->fbc.fbc_work) {
 320                 /* Double check that we haven't switched fb without cancelling
 321                  * the prior work.
 322                  */
 323                 if (work->crtc->fb == work->fb) {
 324                         dev_priv->display.enable_fbc(work->crtc,
 325                                                      work->interval);
 326
 327                         dev_priv->fbc.plane = to_intel_crtc(work->crtc)->plane;
 328                         dev_priv->fbc.fb_id = work->crtc->fb->base.id;
 329                         dev_priv->fbc.y = work->crtc->y;
 330                 }
 331
 332                 dev_priv->fbc.fbc_work = NULL;
 333         }
 334         mutex_unlock(&dev->struct_mutex);
 335
 336         kfree(work);
 337 }
 338
 339 static void intel_cancel_fbc_work(struct drm_i915_private *dev_priv)
 340 {
 341         if (dev_priv->fbc.fbc_work == NULL)
 342                 return;
 343
 344         DRM_DEBUG_KMS("cancelling pending FBC enable\n");
 345
 346         /* Synchronisation is provided by struct_mutex and checking of
 347          * dev_priv->fbc.fbc_work, so we can perform the cancellation
 348          * entirely asynchronously.
 349          */
 350         if (cancel_delayed_work(&dev_priv->fbc.fbc_work->work))
 351                 /* tasklet was killed before being run, clean up */
 352                 kfree(dev_priv->fbc.fbc_work);
 353
 354         /* Mark the work as no longer wanted so that if it does
 355          * wake-up (because the work was already running and waiting
 356          * for our mutex), it will discover that is no longer
 357          * necessary to run.
 358          */
 359         dev_priv->fbc.fbc_work = NULL;
 360 }
 361
 362 static void intel_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
 363 {
 364         struct intel_fbc_work *work;
 365         struct drm_device *dev = crtc->dev;
 366         struct drm_i915_private *dev_priv = dev->dev_private;
 367
 368         if (!dev_priv->display.enable_fbc)
 369                 return;
 370
 371         intel_cancel_fbc_work(dev_priv);
 372
 373         work = kzalloc(sizeof(*work), GFP_KERNEL);
 374         if (work == NULL) {
 375                 DRM_ERROR("Failed to allocate FBC work structure\n");
 376                 dev_priv->display.enable_fbc(crtc, interval);
 377                 return;
 378         }
 379
 380         work->crtc = crtc;
 381         work->fb = crtc->fb;
 382         work->interval = interval;
 383         INIT_DELAYED_WORK(&work->work, intel_fbc_work_fn);
 384
 385         dev_priv->fbc.fbc_work = work;
 386
 387         /* Delay the actual enabling to let pageflipping cease and the
 388          * display to settle before starting the compression. Note that
 389          * this delay also serves a second purpose: it allows for a
 390          * vblank to pass after disabling the FBC before we attempt
 391          * to modify the control registers.
 392          *
 393          * A more complicated solution would involve tracking vblanks
 394          * following the termination of the page-flipping sequence
 395          * and indeed performing the enable as a co-routine and not
 396          * waiting synchronously upon the vblank.
 397          *
 398          * WaFbcWaitForVBlankBeforeEnable:ilk,snb
 399          */
 400         schedule_delayed_work(&work->work, msecs_to_jiffies(50));
 401 }
 402
 403 void intel_disable_fbc(struct drm_device *dev)
 404 {
 405         struct drm_i915_private *dev_priv = dev->dev_private;
 406
 407         intel_cancel_fbc_work(dev_priv);
 408
 409         if (!dev_priv->display.disable_fbc)
 410                 return;
 411
 412         dev_priv->display.disable_fbc(dev);
 413         dev_priv->fbc.plane = -1;
 414 }
 415
 416 static bool set_no_fbc_reason(struct drm_i915_private *dev_priv,
 417                               enum no_fbc_reason reason)
 418 {
 419         if (dev_priv->fbc.no_fbc_reason == reason)
 420                 return false;
 421
 422         dev_priv->fbc.no_fbc_reason = reason;
 423         return true;
 424 }
 425
 426 /**
 427  * intel_update_fbc - enable/disable FBC as needed
 428  * @dev: the drm_device
 429  *
 430  * Set up the framebuffer compression hardware at mode set time.  We
 431  * enable it if possible:
 432  *   - plane A only (on pre-965)
 433  *   - no pixel mulitply/line duplication
 434  *   - no alpha buffer discard
 435  *   - no dual wide
 436  *   - framebuffer <= max_hdisplay in width, max_vdisplay in height
 437  *
 438  * We can't assume that any compression will take place (worst case),
 439  * so the compressed buffer has to be the same size as the uncompressed
 440  * one.  It also must reside (along with the line length buffer) in
 441  * stolen memory.
 442  *
 443  * We need to enable/disable FBC on a global basis.
 444  */
 445 void intel_update_fbc(struct drm_device *dev)
 446 {
 447         struct drm_i915_private *dev_priv = dev->dev_private;
 448         struct drm_crtc *crtc = NULL, *tmp_crtc;
 449         struct intel_crtc *intel_crtc;
 450         struct drm_framebuffer *fb;
 451         struct intel_framebuffer *intel_fb;
 452         struct drm_i915_gem_object *obj;
 453         const struct drm_display_mode *adjusted_mode;
 454         unsigned int max_width, max_height;
 455
 456         if (!I915_HAS_FBC(dev)) {
 457                 set_no_fbc_reason(dev_priv, FBC_UNSUPPORTED);
 458                 return;
 459         }
 460
 461         if (!i915_powersave) {
 462                 if (set_no_fbc_reason(dev_priv, FBC_MODULE_PARAM))
 463                         DRM_DEBUG_KMS("fbc disabled per module param\n");
 464                 return;
 465         }
 466
 467         /*
 468          * If FBC is already on, we just have to verify that we can
 469          * keep it that way...
 470          * Need to disable if:
 471          *   - more than one pipe is active
 472          *   - changing FBC params (stride, fence, mode)
 473          *   - new fb is too large to fit in compressed buffer
 474          *   - going to an unsupported config (interlace, pixel multiply, etc.)
 475          */
 476         list_for_each_entry(tmp_crtc, &dev->mode_config.crtc_list, head) {
 477                 if (intel_crtc_active(tmp_crtc) &&
 478                     to_intel_crtc(tmp_crtc)->primary_enabled) {
 479                         if (crtc) {
 480                                 if (set_no_fbc_reason(dev_priv, FBC_MULTIPLE_PIPES))
 481                                         DRM_DEBUG_KMS("more than one pipe active, disabling compression\n");
 482                                 goto out_disable;
 483                         }
 484                         crtc = tmp_crtc;
 485                 }
 486         }
 487
 488         if (!crtc || crtc->fb == NULL) {
 489                 if (set_no_fbc_reason(dev_priv, FBC_NO_OUTPUT))
 490                         DRM_DEBUG_KMS("no output, disabling\n");
 491                 goto out_disable;
 492         }
 493
 494         intel_crtc = to_intel_crtc(crtc);
 495         fb = crtc->fb;
 496         intel_fb = to_intel_framebuffer(fb);
 497         obj = intel_fb->obj;
 498         adjusted_mode = &intel_crtc->config.adjusted_mode;
 499
 500         if (i915_enable_fbc < 0 &&
 501             INTEL_INFO(dev)->gen <= 7 && !IS_HASWELL(dev)) {
 502                 if (set_no_fbc_reason(dev_priv, FBC_CHIP_DEFAULT))
 503                         DRM_DEBUG_KMS("disabled per chip default\n");
 504                 goto out_disable;
 505         }
 506         if (!i915_enable_fbc) {
 507                 if (set_no_fbc_reason(dev_priv, FBC_MODULE_PARAM))
 508                         DRM_DEBUG_KMS("fbc disabled per module param\n");
 509                 goto out_disable;
 510         }
 511         if ((adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) ||
 512             (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)) {
 513                 if (set_no_fbc_reason(dev_priv, FBC_UNSUPPORTED_MODE))
 514                         DRM_DEBUG_KMS("mode incompatible with compression, "
 515                                       "disabling\n");
 516                 goto out_disable;
 517         }
 518
 519         if (IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
 520                 max_width = 4096;
 521                 max_height = 2048;
 522         } else {
 523                 max_width = 2048;
 524                 max_height = 1536;
 525         }
 526         if (intel_crtc->config.pipe_src_w > max_width ||
 527             intel_crtc->config.pipe_src_h > max_height) {
 528                 if (set_no_fbc_reason(dev_priv, FBC_MODE_TOO_LARGE))
 529                         DRM_DEBUG_KMS("mode too large for compression, disabling\n");
 530                 goto out_disable;
 531         }
 532         if ((IS_I915GM(dev) || IS_I945GM(dev) || IS_HASWELL(dev)) &&
 533             intel_crtc->plane != 0) {
 534                 if (set_no_fbc_reason(dev_priv, FBC_BAD_PLANE))
 535                         DRM_DEBUG_KMS("plane not 0, disabling compression\n");
 536                 goto out_disable;
 537         }
 538
 539         /* The use of a CPU fence is mandatory in order to detect writes
 540          * by the CPU to the scanout and trigger updates to the FBC.
 541          */
 542         if (obj->tiling_mode != I915_TILING_X ||
 543             obj->fence_reg == I915_FENCE_REG_NONE) {
 544                 if (set_no_fbc_reason(dev_priv, FBC_NOT_TILED))
 545                         DRM_DEBUG_KMS("framebuffer not tiled or fenced, disabling compression\n");
 546                 goto out_disable;
 547         }
 548
 549         /* If the kernel debugger is active, always disable compression */
 550         if (in_dbg_master())
 551                 goto out_disable;
 552
 553         if (i915_gem_stolen_setup_compression(dev, intel_fb->obj->base.size)) {
 554                 if (set_no_fbc_reason(dev_priv, FBC_STOLEN_TOO_SMALL))
 555                         DRM_DEBUG_KMS("framebuffer too large, disabling compression\n");
 556                 goto out_disable;
 557         }
 558
 559         /* If the scanout has not changed, don't modify the FBC settings.
 560          * Note that we make the fundamental assumption that the fb->obj
 561          * cannot be unpinned (and have its GTT offset and fence revoked)
 562          * without first being decoupled from the scanout and FBC disabled.
 563          */
 564         if (dev_priv->fbc.plane == intel_crtc->plane &&
 565             dev_priv->fbc.fb_id == fb->base.id &&
 566             dev_priv->fbc.y == crtc->y)
 567                 return;
 568
 569         if (intel_fbc_enabled(dev)) {
 570                 /* We update FBC along two paths, after changing fb/crtc
 571                  * configuration (modeswitching) and after page-flipping
 572                  * finishes. For the latter, we know that not only did
 573                  * we disable the FBC at the start of the page-flip
 574                  * sequence, but also more than one vblank has passed.
 575                  *
 576                  * For the former case of modeswitching, it is possible
 577                  * to switch between two FBC valid configurations
 578                  * instantaneously so we do need to disable the FBC
 579                  * before we can modify its control registers. We also
 580                  * have to wait for the next vblank for that to take
 581                  * effect. However, since we delay enabling FBC we can
 582                  * assume that a vblank has passed since disabling and
 583                  * that we can safely alter the registers in the deferred
 584                  * callback.
 585                  *
 586                  * In the scenario that we go from a valid to invalid
 587                  * and then back to valid FBC configuration we have
 588                  * no strict enforcement that a vblank occurred since
 589                  * disabling the FBC. However, along all current pipe
 590                  * disabling paths we do need to wait for a vblank at
 591                  * some point. And we wait before enabling FBC anyway.
 592                  */
 593                 DRM_DEBUG_KMS("disabling active FBC for update\n");
 594                 intel_disable_fbc(dev);
 595         }
 596
 597         intel_enable_fbc(crtc, 500);
 598         dev_priv->fbc.no_fbc_reason = FBC_OK;
 599         return;
 600
 601 out_disable:
 602         /* Multiple disables should be harmless */
 603         if (intel_fbc_enabled(dev)) {
 604                 DRM_DEBUG_KMS("unsupported config, disabling FBC\n");
 605                 intel_disable_fbc(dev);
 606         }
 607         i915_gem_stolen_cleanup_compression(dev);
 608 }
 609
 610 static void i915_pineview_get_mem_freq(struct drm_device *dev)
 611 {
 612         drm_i915_private_t *dev_priv = dev->dev_private;
 613         u32 tmp;
 614
 615         tmp = I915_READ(CLKCFG);
 616
 617         switch (tmp & CLKCFG_FSB_MASK) {
 618         case CLKCFG_FSB_533:
 619                 dev_priv->fsb_freq = 533; /* 133*4 */
 620                 break;
 621         case CLKCFG_FSB_800:
 622                 dev_priv->fsb_freq = 800; /* 200*4 */
 623                 break;
 624         case CLKCFG_FSB_667:
 625                 dev_priv->fsb_freq =  667; /* 167*4 */
 626                 break;
 627         case CLKCFG_FSB_400:
 628                 dev_priv->fsb_freq = 400; /* 100*4 */
 629                 break;
 630         }
 631
 632         switch (tmp & CLKCFG_MEM_MASK) {
 633         case CLKCFG_MEM_533:
 634                 dev_priv->mem_freq = 533;
 635                 break;
 636         case CLKCFG_MEM_667:
 637                 dev_priv->mem_freq = 667;
 638                 break;
 639         case CLKCFG_MEM_800:
 640                 dev_priv->mem_freq = 800;
 641                 break;
 642         }
 643
 644         /* detect pineview DDR3 setting */
 645         tmp = I915_READ(CSHRDDR3CTL);
 646         dev_priv->is_ddr3 = (tmp & CSHRDDR3CTL_DDR3) ? 1 : 0;
 647 }
 648
 649 static void i915_ironlake_get_mem_freq(struct drm_device *dev)
 650 {
 651         drm_i915_private_t *dev_priv = dev->dev_private;
 652         u16 ddrpll, csipll;
 653
 654         ddrpll = I915_READ16(DDRMPLL1);
 655         csipll = I915_READ16(CSIPLL0);
 656
 657         switch (ddrpll & 0xff) {
 658         case 0xc:
 659                 dev_priv->mem_freq = 800;
 660                 break;
 661         case 0x10:
 662                 dev_priv->mem_freq = 1066;
 663                 break;
 664         case 0x14:
 665                 dev_priv->mem_freq = 1333;
 666                 break;
 667         case 0x18:
 668                 dev_priv->mem_freq = 1600;
 669                 break;
 670         default:
 671                 DRM_DEBUG_DRIVER("unknown memory frequency 0x%02x\n",
 672                                  ddrpll & 0xff);
 673                 dev_priv->mem_freq = 0;
 674                 break;
 675         }
 676
 677         dev_priv->ips.r_t = dev_priv->mem_freq;
 678
 679         switch (csipll & 0x3ff) {
 680         case 0x00c:
 681                 dev_priv->fsb_freq = 3200;
 682                 break;
 683         case 0x00e:
 684                 dev_priv->fsb_freq = 3733;
 685                 break;
 686         case 0x010:
 687                 dev_priv->fsb_freq = 4266;
 688                 break;
 689         case 0x012:
 690                 dev_priv->fsb_freq = 4800;
 691                 break;
 692         case 0x014:
 693                 dev_priv->fsb_freq = 5333;
 694                 break;
 695         case 0x016:
 696                 dev_priv->fsb_freq = 5866;
 697                 break;
 698         case 0x018:
 699                 dev_priv->fsb_freq = 6400;
 700                 break;
 701         default:
 702                 DRM_DEBUG_DRIVER("unknown fsb frequency 0x%04x\n",
 703                                  csipll & 0x3ff);
 704                 dev_priv->fsb_freq = 0;
 705                 break;
 706         }
 707
 708         if (dev_priv->fsb_freq == 3200) {
 709                 dev_priv->ips.c_m = 0;
 710         } else if (dev_priv->fsb_freq > 3200 && dev_priv->fsb_freq <= 4800) {
 711                 dev_priv->ips.c_m = 1;
 712         } else {
 713                 dev_priv->ips.c_m = 2;
 714         }
 715 }
 716
 717 static const struct cxsr_latency cxsr_latency_table[] = {
 718         {1, 0, 800, 400, 3382, 33382, 3983, 33983},    /* DDR2-400 SC */
 719         {1, 0, 800, 667, 3354, 33354, 3807, 33807},    /* DDR2-667 SC */
 720         {1, 0, 800, 800, 3347, 33347, 3763, 33763},    /* DDR2-800 SC */
 721         {1, 1, 800, 667, 6420, 36420, 6873, 36873},    /* DDR3-667 SC */
 722         {1, 1, 800, 800, 5902, 35902, 6318, 36318},    /* DDR3-800 SC */
 723
 724         {1, 0, 667, 400, 3400, 33400, 4021, 34021},    /* DDR2-400 SC */
 725         {1, 0, 667, 667, 3372, 33372, 3845, 33845},    /* DDR2-667 SC */
 726         {1, 0, 667, 800, 3386, 33386, 3822, 33822},    /* DDR2-800 SC */
 727         {1, 1, 667, 667, 6438, 36438, 6911, 36911},    /* DDR3-667 SC */
 728         {1, 1, 667, 800, 5941, 35941, 6377, 36377},    /* DDR3-800 SC */
 729
 730         {1, 0, 400, 400, 3472, 33472, 4173, 34173},    /* DDR2-400 SC */
 731         {1, 0, 400, 667, 3443, 33443, 3996, 33996},    /* DDR2-667 SC */
 732         {1, 0, 400, 800, 3430, 33430, 3946, 33946},    /* DDR2-800 SC */
 733         {1, 1, 400, 667, 6509, 36509, 7062, 37062},    /* DDR3-667 SC */
 734         {1, 1, 400, 800, 5985, 35985, 6501, 36501},    /* DDR3-800 SC */
 735
 736         {0, 0, 800, 400, 3438, 33438, 4065, 34065},    /* DDR2-400 SC */
 737         {0, 0, 800, 667, 3410, 33410, 3889, 33889},    /* DDR2-667 SC */
 738         {0, 0, 800, 800, 3403, 33403, 3845, 33845},    /* DDR2-800 SC */
 739         {0, 1, 800, 667, 6476, 36476, 6955, 36955},    /* DDR3-667 SC */
 740         {0, 1, 800, 800, 5958, 35958, 6400, 36400},    /* DDR3-800 SC */
 741
 742         {0, 0, 667, 400, 3456, 33456, 4103, 34106},    /* DDR2-400 SC */
 743         {0, 0, 667, 667, 3428, 33428, 3927, 33927},    /* DDR2-667 SC */
 744         {0, 0, 667, 800, 3443, 33443, 3905, 33905},    /* DDR2-800 SC */
 745         {0, 1, 667, 667, 6494, 36494, 6993, 36993},    /* DDR3-667 SC */
 746         {0, 1, 667, 800, 5998, 35998, 6460, 36460},    /* DDR3-800 SC */
 747
 748         {0, 0, 400, 400, 3528, 33528, 4255, 34255},    /* DDR2-400 SC */
 749         {0, 0, 400, 667, 3500, 33500, 4079, 34079},    /* DDR2-667 SC */
 750         {0, 0, 400, 800, 3487, 33487, 4029, 34029},    /* DDR2-800 SC */
 751         {0, 1, 400, 667, 6566, 36566, 7145, 37145},    /* DDR3-667 SC */
 752         {0, 1, 400, 800, 6042, 36042, 6584, 36584},    /* DDR3-800 SC */
 753 };
 754
 755 static const struct cxsr_latency *intel_get_cxsr_latency(int is_desktop,
 756                                                          int is_ddr3,
 757                                                          int fsb,
 758                                                          int mem)
 759 {
 760         const struct cxsr_latency *latency;
 761         int i;
 762
 763         if (fsb == 0 || mem == 0)
 764                 return NULL;
 765
 766         for (i = 0; i < ARRAY_SIZE(cxsr_latency_table); i++) {
 767                 latency = &cxsr_latency_table[i];
 768                 if (is_desktop == latency->is_desktop &&
 769                     is_ddr3 == latency->is_ddr3 &&
 770                     fsb == latency->fsb_freq && mem == latency->mem_freq)
 771                         return latency;
 772         }
 773
 774         DRM_DEBUG_KMS("Unknown FSB/MEM found, disable CxSR\n");
 775
 776         return NULL;
 777 }
 778
 779 static void pineview_disable_cxsr(struct drm_device *dev)
 780 {
 781         struct drm_i915_private *dev_priv = dev->dev_private;
 782
 783         /* deactivate cxsr */
 784         I915_WRITE(DSPFW3, I915_READ(DSPFW3) & ~PINEVIEW_SELF_REFRESH_EN);
 785 }
 786
 787 /*
 788  * Latency for FIFO fetches is dependent on several factors:
 789  *   - memory configuration (speed, channels)
 790  *   - chipset
 791  *   - current MCH state
 792  * It can be fairly high in some situations, so here we assume a fairly
 793  * pessimal value.  It's a tradeoff between extra memory fetches (if we
 794  * set this value too high, the FIFO will fetch frequently to stay full)
 795  * and power consumption (set it too low to save power and we might see
 796  * FIFO underruns and display "flicker").
 797  *
 798  * A value of 5us seems to be a good balance; safe for very low end
 799  * platforms but not overly aggressive on lower latency configs.
 800  */
 801 static const int latency_ns = 5000;
 802
 803 static int i9xx_get_fifo_size(struct drm_device *dev, int plane)
 804 {
 805         struct drm_i915_private *dev_priv = dev->dev_private;
 806         uint32_t dsparb = I915_READ(DSPARB);
 807         int size;
 808
 809         size = dsparb & 0x7f;
 810         if (plane)
 811                 size = ((dsparb >> DSPARB_CSTART_SHIFT) & 0x7f) - size;
 812
 813         DRM_DEBUG_KMS("FIFO size - (0x%08x) %s: %d\n", dsparb,
 814                       plane ? "B" : "A", size);
 815
 816         return size;
 817 }
 818
 819 static int i85x_get_fifo_size(struct drm_device *dev, int plane)
 820 {
 821         struct drm_i915_private *dev_priv = dev->dev_private;
 822         uint32_t dsparb = I915_READ(DSPARB);
 823         int size;
 824
 825         size = dsparb & 0x1ff;
 826         if (plane)
 827                 size = ((dsparb >> DSPARB_BEND_SHIFT) & 0x1ff) - size;
 828         size >>= 1; /* Convert to cachelines */
 829
 830         DRM_DEBUG_KMS("FIFO size - (0x%08x) %s: %d\n", dsparb,
 831                       plane ? "B" : "A", size);
 832
 833         return size;
 834 }
 835
 836 static int i845_get_fifo_size(struct drm_device *dev, int plane)
 837 {
 838         struct drm_i915_private *dev_priv = dev->dev_private;
 839         uint32_t dsparb = I915_READ(DSPARB);
 840         int size;
 841
 842         size = dsparb & 0x7f;
 843         size >>= 2; /* Convert to cachelines */
 844
 845         DRM_DEBUG_KMS("FIFO size - (0x%08x) %s: %d\n", dsparb,
 846                       plane ? "B" : "A",
 847                       size);
 848
 849         return size;
 850 }
 851
 852 static int i830_get_fifo_size(struct drm_device *dev, int plane)
 853 {
 854         struct drm_i915_private *dev_priv = dev->dev_private;
 855         uint32_t dsparb = I915_READ(DSPARB);
 856         int size;
 857
 858         size = dsparb & 0x7f;
 859         size >>= 1; /* Convert to cachelines */
 860
 861         DRM_DEBUG_KMS("FIFO size - (0x%08x) %s: %d\n", dsparb,
 862                       plane ? "B" : "A", size);
 863
 864         return size;
 865 }
 866
 867 /* Pineview has different values for various configs */
 868 static const struct intel_watermark_params pineview_display_wm = {
 869         PINEVIEW_DISPLAY_FIFO,
 870         PINEVIEW_MAX_WM,
 871         PINEVIEW_DFT_WM,
 872         PINEVIEW_GUARD_WM,
 873         PINEVIEW_FIFO_LINE_SIZE
 874 };
 875 static const struct intel_watermark_params pineview_display_hplloff_wm = {
 876         PINEVIEW_DISPLAY_FIFO,
 877         PINEVIEW_MAX_WM,
 878         PINEVIEW_DFT_HPLLOFF_WM,
 879         PINEVIEW_GUARD_WM,
 880         PINEVIEW_FIFO_LINE_SIZE
 881 };
 882 static const struct intel_watermark_params pineview_cursor_wm = {
 883         PINEVIEW_CURSOR_FIFO,
 884         PINEVIEW_CURSOR_MAX_WM,
 885         PINEVIEW_CURSOR_DFT_WM,
 886         PINEVIEW_CURSOR_GUARD_WM,
 887         PINEVIEW_FIFO_LINE_SIZE,
 888 };
 889 static const struct intel_watermark_params pineview_cursor_hplloff_wm = {
 890         PINEVIEW_CURSOR_FIFO,
 891         PINEVIEW_CURSOR_MAX_WM,
 892         PINEVIEW_CURSOR_DFT_WM,
 893         PINEVIEW_CURSOR_GUARD_WM,
 894         PINEVIEW_FIFO_LINE_SIZE
 895 };
 896 static const struct intel_watermark_params g4x_wm_info = {
 897         G4X_FIFO_SIZE,
 898         G4X_MAX_WM,
 899         G4X_MAX_WM,
 900         2,
 901         G4X_FIFO_LINE_SIZE,
 902 };
 903 static const struct intel_watermark_params g4x_cursor_wm_info = {
 904         I965_CURSOR_FIFO,
 905         I965_CURSOR_MAX_WM,
 906         I965_CURSOR_DFT_WM,
 907         2,
 908         G4X_FIFO_LINE_SIZE,
 909 };
 910 static const struct intel_watermark_params valleyview_wm_info = {
 911         VALLEYVIEW_FIFO_SIZE,
 912         VALLEYVIEW_MAX_WM,
 913         VALLEYVIEW_MAX_WM,
 914         2,
 915         G4X_FIFO_LINE_SIZE,
 916 };
 917 static const struct intel_watermark_params valleyview_cursor_wm_info = {
 918         I965_CURSOR_FIFO,
 919         VALLEYVIEW_CURSOR_MAX_WM,
 920         I965_CURSOR_DFT_WM,
 921         2,
 922         G4X_FIFO_LINE_SIZE,
 923 };
 924 static const struct intel_watermark_params i965_cursor_wm_info = {
 925         I965_CURSOR_FIFO,
 926         I965_CURSOR_MAX_WM,
 927         I965_CURSOR_DFT_WM,
 928         2,
 929         I915_FIFO_LINE_SIZE,
 930 };
 931 static const struct intel_watermark_params i945_wm_info = {
 932         I945_FIFO_SIZE,
 933         I915_MAX_WM,
 934         1,
 935         2,
 936         I915_FIFO_LINE_SIZE
 937 };
 938 static const struct intel_watermark_params i915_wm_info = {
 939         I915_FIFO_SIZE,
 940         I915_MAX_WM,
 941         1,
 942         2,
 943         I915_FIFO_LINE_SIZE
 944 };
 945 static const struct intel_watermark_params i855_wm_info = {
 946         I855GM_FIFO_SIZE,
 947         I915_MAX_WM,
 948         1,
 949         2,
 950         I830_FIFO_LINE_SIZE
 951 };
 952 static const struct intel_watermark_params i830_wm_info = {
 953         I830_FIFO_SIZE,
 954         I915_MAX_WM,
 955         1,
 956         2,
 957         I830_FIFO_LINE_SIZE
 958 };
 959
 960 static const struct intel_watermark_params ironlake_display_wm_info = {
 961         ILK_DISPLAY_FIFO,
 962         ILK_DISPLAY_MAXWM,
 963         ILK_DISPLAY_DFTWM,
 964         2,
 965         ILK_FIFO_LINE_SIZE
 966 };
 967 static const struct intel_watermark_params ironlake_cursor_wm_info = {
 968         ILK_CURSOR_FIFO,
 969         ILK_CURSOR_MAXWM,
 970         ILK_CURSOR_DFTWM,
 971         2,
 972         ILK_FIFO_LINE_SIZE
 973 };
 974 static const struct intel_watermark_params ironlake_display_srwm_info = {
 975         ILK_DISPLAY_SR_FIFO,
 976         ILK_DISPLAY_MAX_SRWM,
 977         ILK_DISPLAY_DFT_SRWM,
 978         2,
 979         ILK_FIFO_LINE_SIZE
 980 };
 981 static const struct intel_watermark_params ironlake_cursor_srwm_info = {
 982         ILK_CURSOR_SR_FIFO,
 983         ILK_CURSOR_MAX_SRWM,
 984         ILK_CURSOR_DFT_SRWM,
 985         2,
 986         ILK_FIFO_LINE_SIZE
 987 };
 988
 989 static const struct intel_watermark_params sandybridge_display_wm_info = {
 990         SNB_DISPLAY_FIFO,
 991         SNB_DISPLAY_MAXWM,
 992         SNB_DISPLAY_DFTWM,
 993         2,
 994         SNB_FIFO_LINE_SIZE
 995 };
 996 static const struct intel_watermark_params sandybridge_cursor_wm_info = {
 997         SNB_CURSOR_FIFO,
 998         SNB_CURSOR_MAXWM,
 999         SNB_CURSOR_DFTWM,
1000         2,
1001         SNB_FIFO_LINE_SIZE
1002 };
1003 static const struct intel_watermark_params sandybridge_display_srwm_info = {
1004         SNB_DISPLAY_SR_FIFO,
1005         SNB_DISPLAY_MAX_SRWM,
1006         SNB_DISPLAY_DFT_SRWM,
1007         2,
1008         SNB_FIFO_LINE_SIZE
1009 };
1010 static const struct intel_watermark_params sandybridge_cursor_srwm_info = {
1011         SNB_CURSOR_SR_FIFO,
1012         SNB_CURSOR_MAX_SRWM,
1013         SNB_CURSOR_DFT_SRWM,
1014         2,
1015         SNB_FIFO_LINE_SIZE
1016 };
1017
1018
1019 /**
1020  * intel_calculate_wm - calculate watermark level
1021  * @clock_in_khz: pixel clock
1022  * @wm: chip FIFO params
1023  * @pixel_size: display pixel size
1024  * @latency_ns: memory latency for the platform
1025  *
1026  * Calculate the watermark level (the level at which the display plane will
1027  * start fetching from memory again).  Each chip has a different display
1028  * FIFO size and allocation, so the caller needs to figure that out and pass
1029  * in the correct intel_watermark_params structure.
1030  *
1031  * As the pixel clock runs, the FIFO will be drained at a rate that depends
1032  * on the pixel size.  When it reaches the watermark level, it'll start
1033  * fetching FIFO line sized based chunks from memory until the FIFO fills
1034  * past the watermark point.  If the FIFO drains completely, a FIFO underrun
1035  * will occur, and a display engine hang could result.
1036  */
1037 static unsigned long intel_calculate_wm(unsigned long clock_in_khz,
1038                                         const struct intel_watermark_params *wm,
1039                                         int fifo_size,
1040                                         int pixel_size,
1041                                         unsigned long latency_ns)
1042 {
1043         long entries_required, wm_size;
1044
1045         /*
1046          * Note: we need to make sure we don't overflow for various clock &
1047          * latency values.
1048          * clocks go from a few thousand to several hundred thousand.
1049          * latency is usually a few thousand
1050          */
1051         entries_required = ((clock_in_khz / 1000) * pixel_size * latency_ns) /
1052                 1000;
1053         entries_required = DIV_ROUND_UP(entries_required, wm->cacheline_size);
1054
1055         DRM_DEBUG_KMS("FIFO entries required for mode: %ld\n", entries_required);
1056
1057         wm_size = fifo_size - (entries_required + wm->guard_size);
1058
1059         DRM_DEBUG_KMS("FIFO watermark level: %ld\n", wm_size);
1060
1061         /* Don't promote wm_size to unsigned... */
1062         if (wm_size > (long)wm->max_wm)
1063                 wm_size = wm->max_wm;
1064         if (wm_size <= 0)
1065                 wm_size = wm->default_wm;
1066         return wm_size;
1067 }
1068
1069 static struct drm_crtc *single_enabled_crtc(struct drm_device *dev)
1070 {
1071         struct drm_crtc *crtc, *enabled = NULL;
1072
1073         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1074                 if (intel_crtc_active(crtc)) {
1075                         if (enabled)
1076                                 return NULL;
1077                         enabled = crtc;
1078                 }
1079         }
1080
1081         return enabled;
1082 }
1083
1084 static void pineview_update_wm(struct drm_crtc *unused_crtc)
1085 {
1086         struct drm_device *dev = unused_crtc->dev;
1087         struct drm_i915_private *dev_priv = dev->dev_private;
1088         struct drm_crtc *crtc;
1089         const struct cxsr_latency *latency;
1090         u32 reg;
1091         unsigned long wm;
1092
1093         latency = intel_get_cxsr_latency(IS_PINEVIEW_G(dev), dev_priv->is_ddr3,
1094                                          dev_priv->fsb_freq, dev_priv->mem_freq);
1095         if (!latency) {
1096                 DRM_DEBUG_KMS("Unknown FSB/MEM found, disable CxSR\n");
1097                 pineview_disable_cxsr(dev);
1098                 return;
1099         }
1100
1101         crtc = single_enabled_crtc(dev);
1102         if (crtc) {
1103                 const struct drm_display_mode *adjusted_mode;
1104                 int pixel_size = crtc->fb->bits_per_pixel / 8;
1105                 int clock;
1106
1107                 adjusted_mode = &to_intel_crtc(crtc)->config.adjusted_mode;
1108                 clock = adjusted_mode->crtc_clock;
1109
1110                 /* Display SR */
1111                 wm = intel_calculate_wm(clock, &pineview_display_wm,
1112                                         pineview_display_wm.fifo_size,
1113                                         pixel_size, latency->display_sr);
1114                 reg = I915_READ(DSPFW1);
1115                 reg &= ~DSPFW_SR_MASK;
1116                 reg |= wm << DSPFW_SR_SHIFT;
1117                 I915_WRITE(DSPFW1, reg);
1118                 DRM_DEBUG_KMS("DSPFW1 register is %x\n", reg);
1119
1120                 /* cursor SR */
1121                 wm = intel_calculate_wm(clock, &pineview_cursor_wm,
1122                                         pineview_display_wm.fifo_size,
1123                                         pixel_size, latency->cursor_sr);
1124                 reg = I915_READ(DSPFW3);
1125                 reg &= ~DSPFW_CURSOR_SR_MASK;
1126                 reg |= (wm & 0x3f) << DSPFW_CURSOR_SR_SHIFT;
1127                 I915_WRITE(DSPFW3, reg);
1128
1129                 /* Display HPLL off SR */
1130                 wm = intel_calculate_wm(clock, &pineview_display_hplloff_wm,
1131                                         pineview_display_hplloff_wm.fifo_size,
1132                                         pixel_size, latency->display_hpll_disable);
1133                 reg = I915_READ(DSPFW3);
1134                 reg &= ~DSPFW_HPLL_SR_MASK;
1135                 reg |= wm & DSPFW_HPLL_SR_MASK;
1136                 I915_WRITE(DSPFW3, reg);
1137
1138                 /* cursor HPLL off SR */
1139                 wm = intel_calculate_wm(clock, &pineview_cursor_hplloff_wm,
1140                                         pineview_display_hplloff_wm.fifo_size,
1141                                         pixel_size, latency->cursor_hpll_disable);
1142                 reg = I915_READ(DSPFW3);
1143                 reg &= ~DSPFW_HPLL_CURSOR_MASK;
1144                 reg |= (wm & 0x3f) << DSPFW_HPLL_CURSOR_SHIFT;
1145                 I915_WRITE(DSPFW3, reg);
1146                 DRM_DEBUG_KMS("DSPFW3 register is %x\n", reg);
1147
1148                 /* activate cxsr */
1149                 I915_WRITE(DSPFW3,
1150                            I915_READ(DSPFW3) | PINEVIEW_SELF_REFRESH_EN);
1151                 DRM_DEBUG_KMS("Self-refresh is enabled\n");
1152         } else {
1153                 pineview_disable_cxsr(dev);
1154                 DRM_DEBUG_KMS("Self-refresh is disabled\n");
1155         }
1156 }
1157
1158 static bool g4x_compute_wm0(struct drm_device *dev,
1159                             int plane,
1160                             const struct intel_watermark_params *display,
1161                             int display_latency_ns,
1162                             const struct intel_watermark_params *cursor,
1163                             int cursor_latency_ns,
1164                             int *plane_wm,
1165                             int *cursor_wm)
1166 {
1167         struct drm_crtc *crtc;
1168         const struct drm_display_mode *adjusted_mode;
1169         int htotal, hdisplay, clock, pixel_size;
1170         int line_time_us, line_count;
1171         int entries, tlb_miss;
1172
1173         crtc = intel_get_crtc_for_plane(dev, plane);
1174         if (!intel_crtc_active(crtc)) {
1175                 *cursor_wm = cursor->guard_size;
1176                 *plane_wm = display->guard_size;
1177                 return false;
1178         }
1179
1180         adjusted_mode = &to_intel_crtc(crtc)->config.adjusted_mode;
1181         clock = adjusted_mode->crtc_clock;
1182         htotal = adjusted_mode->htotal;
1183         hdisplay = to_intel_crtc(crtc)->config.pipe_src_w;
1184         pixel_size = crtc->fb->bits_per_pixel / 8;
1185
1186         /* Use the small buffer method to calculate plane watermark */
1187         entries = ((clock * pixel_size / 1000) * display_latency_ns) / 1000;
1188         tlb_miss = display->fifo_size*display->cacheline_size - hdisplay * 8;
1189         if (tlb_miss > 0)
1190                 entries += tlb_miss;
1191         entries = DIV_ROUND_UP(entries, display->cacheline_size);
1192         *plane_wm = entries + display->guard_size;
1193         if (*plane_wm > (int)display->max_wm)
1194                 *plane_wm = display->max_wm;
1195
1196         /* Use the large buffer method to calculate cursor watermark */
1197         line_time_us = ((htotal * 1000) / clock);
1198         line_count = (cursor_latency_ns / line_time_us + 1000) / 1000;
1199         entries = line_count * 64 * pixel_size;
1200         tlb_miss = cursor->fifo_size*cursor->cacheline_size - hdisplay * 8;
1201         if (tlb_miss > 0)
1202                 entries += tlb_miss;
1203         entries = DIV_ROUND_UP(entries, cursor->cacheline_size);
1204         *cursor_wm = entries + cursor->guard_size;
1205         if (*cursor_wm > (int)cursor->max_wm)
1206                 *cursor_wm = (int)cursor->max_wm;
1207
1208         return true;
1209 }
1210
1211 /*
1212  * Check the wm result.
1213  *
1214  * If any calculated watermark values is larger than the maximum value that
1215  * can be programmed into the associated watermark register, that watermark
1216  * must be disabled.
1217  */
1218 static bool g4x_check_srwm(struct drm_device *dev,
1219                            int display_wm, int cursor_wm,
1220                            const struct intel_watermark_params *display,
1221                            const struct intel_watermark_params *cursor)
1222 {
1223         DRM_DEBUG_KMS("SR watermark: display plane %d, cursor %d\n",
1224                       display_wm, cursor_wm);
1225
1226         if (display_wm > display->max_wm) {
1227                 DRM_DEBUG_KMS("display watermark is too large(%d/%ld), disabling\n",
1228                               display_wm, display->max_wm);
1229                 return false;
1230         }
1231
1232         if (cursor_wm > cursor->max_wm) {
1233                 DRM_DEBUG_KMS("cursor watermark is too large(%d/%ld), disabling\n",
1234                               cursor_wm, cursor->max_wm);
1235                 return false;
1236         }
1237
1238         if (!(display_wm || cursor_wm)) {
1239                 DRM_DEBUG_KMS("SR latency is 0, disabling\n");
1240                 return false;
1241         }
1242
1243         return true;
1244 }
1245
1246 static bool g4x_compute_srwm(struct drm_device *dev,
1247                              int plane,
1248                              int latency_ns,
1249                              const struct intel_watermark_params *display,
1250                              const struct intel_watermark_params *cursor,
1251                              int *display_wm, int *cursor_wm)
1252 {
1253         struct drm_crtc *crtc;
1254         const struct drm_display_mode *adjusted_mode;
1255         int hdisplay, htotal, pixel_size, clock;
1256         unsigned long line_time_us;
1257         int line_count, line_size;
1258         int small, large;
1259         int entries;
1260
1261         if (!latency_ns) {
1262                 *display_wm = *cursor_wm = 0;
1263                 return false;
1264         }
1265
1266         crtc = intel_get_crtc_for_plane(dev, plane);
1267         adjusted_mode = &to_intel_crtc(crtc)->config.adjusted_mode;
1268         clock = adjusted_mode->crtc_clock;
1269         htotal = adjusted_mode->htotal;
1270         hdisplay = to_intel_crtc(crtc)->config.pipe_src_w;
1271         pixel_size = crtc->fb->bits_per_pixel / 8;
1272
1273         line_time_us = (htotal * 1000) / clock;
1274         line_count = (latency_ns / line_time_us + 1000) / 1000;
1275         line_size = hdisplay * pixel_size;
1276
1277         /* Use the minimum of the small and large buffer method for primary */
1278         small = ((clock * pixel_size / 1000) * latency_ns) / 1000;
1279         large = line_count * line_size;
1280
1281         entries = DIV_ROUND_UP(min(small, large), display->cacheline_size);
1282         *display_wm = entries + display->guard_size;
1283
1284         /* calculate the self-refresh watermark for display cursor */
1285         entries = line_count * pixel_size * 64;
1286         entries = DIV_ROUND_UP(entries, cursor->cacheline_size);
1287         *cursor_wm = entries + cursor->guard_size;
1288
1289         return g4x_check_srwm(dev,
1290                               *display_wm, *cursor_wm,
1291                               display, cursor);
1292 }
1293
1294 static bool vlv_compute_drain_latency(struct drm_device *dev,
1295                                      int plane,
1296                                      int *plane_prec_mult,
1297                                      int *plane_dl,
1298                                      int *cursor_prec_mult,
1299                                      int *cursor_dl)
1300 {
1301         struct drm_crtc *crtc;
1302         int clock, pixel_size;
1303         int entries;
1304
1305         crtc = intel_get_crtc_for_plane(dev, plane);
1306         if (!intel_crtc_active(crtc))
1307                 return false;
1308
1309         clock = to_intel_crtc(crtc)->config.adjusted_mode.crtc_clock;
1310         pixel_size = crtc->fb->bits_per_pixel / 8;      /* BPP */
1311
1312         entries = (clock / 1000) * pixel_size;
1313         *plane_prec_mult = (entries > 256) ?
1314                 DRAIN_LATENCY_PRECISION_32 : DRAIN_LATENCY_PRECISION_16;
1315         *plane_dl = (64 * (*plane_prec_mult) * 4) / ((clock / 1000) *
1316                                                      pixel_size);
1317
1318         entries = (clock / 1000) * 4;   /* BPP is always 4 for cursor */
1319         *cursor_prec_mult = (entries > 256) ?
1320                 DRAIN_LATENCY_PRECISION_32 : DRAIN_LATENCY_PRECISION_16;
1321         *cursor_dl = (64 * (*cursor_prec_mult) * 4) / ((clock / 1000) * 4);
1322
1323         return true;
1324 }
1325
1326 /*
1327  * Update drain latency registers of memory arbiter
1328  *
1329  * Valleyview SoC has a new memory arbiter and needs drain latency registers
1330  * to be programmed. Each plane has a drain latency multiplier and a drain
1331  * latency value.
1332  */
1333
1334 static void vlv_update_drain_latency(struct drm_device *dev)
1335 {
1336         struct drm_i915_private *dev_priv = dev->dev_private;
1337         int planea_prec, planea_dl, planeb_prec, planeb_dl;
1338         int cursora_prec, cursora_dl, cursorb_prec, cursorb_dl;
1339         int plane_prec_mult, cursor_prec_mult; /* Precision multiplier is
1340                                                         either 16 or 32 */
1341
1342         /* For plane A, Cursor A */
1343         if (vlv_compute_drain_latency(dev, 0, &plane_prec_mult, &planea_dl,
1344                                       &cursor_prec_mult, &cursora_dl)) {
1345                 cursora_prec = (cursor_prec_mult == DRAIN_LATENCY_PRECISION_32) ?
1346                         DDL_CURSORA_PRECISION_32 : DDL_CURSORA_PRECISION_16;
1347                 planea_prec = (plane_prec_mult == DRAIN_LATENCY_PRECISION_32) ?
1348                         DDL_PLANEA_PRECISION_32 : DDL_PLANEA_PRECISION_16;
1349
1350                 I915_WRITE(VLV_DDL1, cursora_prec |
1351                                 (cursora_dl << DDL_CURSORA_SHIFT) |
1352                                 planea_prec | planea_dl);
1353         }
1354
1355         /* For plane B, Cursor B */
1356         if (vlv_compute_drain_latency(dev, 1, &plane_prec_mult, &planeb_dl,
1357                                       &cursor_prec_mult, &cursorb_dl)) {
1358                 cursorb_prec = (cursor_prec_mult == DRAIN_LATENCY_PRECISION_32) ?
1359                         DDL_CURSORB_PRECISION_32 : DDL_CURSORB_PRECISION_16;
1360                 planeb_prec = (plane_prec_mult == DRAIN_LATENCY_PRECISION_32) ?
1361                         DDL_PLANEB_PRECISION_32 : DDL_PLANEB_PRECISION_16;
1362
1363                 I915_WRITE(VLV_DDL2, cursorb_prec |
1364                                 (cursorb_dl << DDL_CURSORB_SHIFT) |
1365                                 planeb_prec | planeb_dl);
1366         }
1367 }
1368
1369 #define single_plane_enabled(mask) is_power_of_2(mask)
1370
1371 static void valleyview_update_wm(struct drm_crtc *crtc)
1372 {
1373         struct drm_device *dev = crtc->dev;
1374         static const int sr_latency_ns = 12000;
1375         struct drm_i915_private *dev_priv = dev->dev_private;
1376         int planea_wm, planeb_wm, cursora_wm, cursorb_wm;
1377         int plane_sr, cursor_sr;
1378         int ignore_plane_sr, ignore_cursor_sr;
1379         unsigned int enabled = 0;
1380
1381         vlv_update_drain_latency(dev);
1382
1383         if (g4x_compute_wm0(dev, PIPE_A,
1384                             &valleyview_wm_info, latency_ns,
1385                             &valleyview_cursor_wm_info, latency_ns,
1386                             &planea_wm, &cursora_wm))
1387                 enabled |= 1 << PIPE_A;
1388
1389         if (g4x_compute_wm0(dev, PIPE_B,
1390                             &valleyview_wm_info, latency_ns,
1391                             &valleyview_cursor_wm_info, latency_ns,
1392                             &planeb_wm, &cursorb_wm))
1393                 enabled |= 1 << PIPE_B;
1394
1395         if (single_plane_enabled(enabled) &&
1396             g4x_compute_srwm(dev, ffs(enabled) - 1,
1397                              sr_latency_ns,
1398                              &valleyview_wm_info,
1399                              &valleyview_cursor_wm_info,
1400                              &plane_sr, &ignore_cursor_sr) &&
1401             g4x_compute_srwm(dev, ffs(enabled) - 1,
1402                              2*sr_latency_ns,
1403                              &valleyview_wm_info,
1404                              &valleyview_cursor_wm_info,
1405                              &ignore_plane_sr, &cursor_sr)) {
1406                 I915_WRITE(FW_BLC_SELF_VLV, FW_CSPWRDWNEN);
1407         } else {
1408                 I915_WRITE(FW_BLC_SELF_VLV,
1409                            I915_READ(FW_BLC_SELF_VLV) & ~FW_CSPWRDWNEN);
1410                 plane_sr = cursor_sr = 0;
1411         }
1412
1413         DRM_DEBUG_KMS("Setting FIFO watermarks - A: plane=%d, cursor=%d, B: plane=%d, cursor=%d, SR: plane=%d, cursor=%d\n",
1414                       planea_wm, cursora_wm,
1415                       planeb_wm, cursorb_wm,
1416                       plane_sr, cursor_sr);
1417
1418         I915_WRITE(DSPFW1,
1419                    (plane_sr << DSPFW_SR_SHIFT) |
1420                    (cursorb_wm << DSPFW_CURSORB_SHIFT) |
1421                    (planeb_wm << DSPFW_PLANEB_SHIFT) |
1422                    planea_wm);
1423         I915_WRITE(DSPFW2,
1424                    (I915_READ(DSPFW2) & ~DSPFW_CURSORA_MASK) |
1425                    (cursora_wm << DSPFW_CURSORA_SHIFT));
1426         I915_WRITE(DSPFW3,
1427                    (I915_READ(DSPFW3) & ~DSPFW_CURSOR_SR_MASK) |
1428                    (cursor_sr << DSPFW_CURSOR_SR_SHIFT));
1429 }
1430
1431 static void g4x_update_wm(struct drm_crtc *crtc)
1432 {
1433         struct drm_device *dev = crtc->dev;
1434         static const int sr_latency_ns = 12000;
1435         struct drm_i915_private *dev_priv = dev->dev_private;
1436         int planea_wm, planeb_wm, cursora_wm, cursorb_wm;
1437         int plane_sr, cursor_sr;
1438         unsigned int enabled = 0;
1439
1440         if (g4x_compute_wm0(dev, PIPE_A,
1441                             &g4x_wm_info, latency_ns,
1442                             &g4x_cursor_wm_info, latency_ns,
1443                             &planea_wm, &cursora_wm))
1444                 enabled |= 1 << PIPE_A;
1445
1446         if (g4x_compute_wm0(dev, PIPE_B,
1447                             &g4x_wm_info, latency_ns,
1448                             &g4x_cursor_wm_info, latency_ns,
1449                             &planeb_wm, &cursorb_wm))
1450                 enabled |= 1 << PIPE_B;
1451
1452         if (single_plane_enabled(enabled) &&
1453             g4x_compute_srwm(dev, ffs(enabled) - 1,
1454                              sr_latency_ns,
1455                              &g4x_wm_info,
1456                              &g4x_cursor_wm_info,
1457                              &plane_sr, &cursor_sr)) {
1458                 I915_WRITE(FW_BLC_SELF, FW_BLC_SELF_EN);
1459         } else {
1460                 I915_WRITE(FW_BLC_SELF,
1461                            I915_READ(FW_BLC_SELF) & ~FW_BLC_SELF_EN);
1462                 plane_sr = cursor_sr = 0;
1463         }
1464
1465         DRM_DEBUG_KMS("Setting FIFO watermarks - A: plane=%d, cursor=%d, B: plane=%d, cursor=%d, SR: plane=%d, cursor=%d\n",
1466                       planea_wm, cursora_wm,
1467                       planeb_wm, cursorb_wm,
1468                       plane_sr, cursor_sr);
1469
1470         I915_WRITE(DSPFW1,
1471                    (plane_sr << DSPFW_SR_SHIFT) |
1472                    (cursorb_wm << DSPFW_CURSORB_SHIFT) |
1473                    (planeb_wm << DSPFW_PLANEB_SHIFT) |
1474                    planea_wm);
1475         I915_WRITE(DSPFW2,
1476                    (I915_READ(DSPFW2) & ~DSPFW_CURSORA_MASK) |
1477                    (cursora_wm << DSPFW_CURSORA_SHIFT));
1478         /* HPLL off in SR has some issues on G4x... disable it */
1479         I915_WRITE(DSPFW3,
1480                    (I915_READ(DSPFW3) & ~(DSPFW_HPLL_SR_EN | DSPFW_CURSOR_SR_MASK)) |
1481                    (cursor_sr << DSPFW_CURSOR_SR_SHIFT));
1482 }
1483
1484 static void i965_update_wm(struct drm_crtc *unused_crtc)
1485 {
1486         struct drm_device *dev = unused_crtc->dev;
1487         struct drm_i915_private *dev_priv = dev->dev_private;
1488         struct drm_crtc *crtc;
1489         int srwm = 1;
1490         int cursor_sr = 16;
1491
1492         /* Calc sr entries for one plane configs */
1493         crtc = single_enabled_crtc(dev);
1494         if (crtc) {
1495                 /* self-refresh has much higher latency */
1496                 static const int sr_latency_ns = 12000;
1497                 const struct drm_display_mode *adjusted_mode =
1498                         &to_intel_crtc(crtc)->config.adjusted_mode;
1499                 int clock = adjusted_mode->crtc_clock;
1500                 int htotal = adjusted_mode->htotal;
1501                 int hdisplay = to_intel_crtc(crtc)->config.pipe_src_w;
1502                 int pixel_size = crtc->fb->bits_per_pixel / 8;
1503                 unsigned long line_time_us;
1504                 int entries;
1505
1506                 line_time_us = ((htotal * 1000) / clock);
1507
1508                 /* Use ns/us then divide to preserve precision */
1509                 entries = (((sr_latency_ns / line_time_us) + 1000) / 1000) *
1510                         pixel_size * hdisplay;
1511                 entries = DIV_ROUND_UP(entries, I915_FIFO_LINE_SIZE);
1512                 srwm = I965_FIFO_SIZE - entries;
1513                 if (srwm < 0)
1514                         srwm = 1;
1515                 srwm &= 0x1ff;
1516                 DRM_DEBUG_KMS("self-refresh entries: %d, wm: %d\n",
1517                               entries, srwm);
1518
1519                 entries = (((sr_latency_ns / line_time_us) + 1000) / 1000) *
1520                         pixel_size * 64;
1521                 entries = DIV_ROUND_UP(entries,
1522                                           i965_cursor_wm_info.cacheline_size);
1523                 cursor_sr = i965_cursor_wm_info.fifo_size -
1524                         (entries + i965_cursor_wm_info.guard_size);
1525
1526                 if (cursor_sr > i965_cursor_wm_info.max_wm)
1527                         cursor_sr = i965_cursor_wm_info.max_wm;
1528
1529                 DRM_DEBUG_KMS("self-refresh watermark: display plane %d "
1530                               "cursor %d\n", srwm, cursor_sr);
1531
1532                 if (IS_CRESTLINE(dev))
1533                         I915_WRITE(FW_BLC_SELF, FW_BLC_SELF_EN);
1534         } else {
1535                 /* Turn off self refresh if both pipes are enabled */
1536                 if (IS_CRESTLINE(dev))
1537                         I915_WRITE(FW_BLC_SELF, I915_READ(FW_BLC_SELF)
1538                                    & ~FW_BLC_SELF_EN);
1539         }
1540
1541         DRM_DEBUG_KMS("Setting FIFO watermarks - A: 8, B: 8, C: 8, SR %d\n",
1542                       srwm);
1543
1544         /* 965 has limitations... */
1545         I915_WRITE(DSPFW1, (srwm << DSPFW_SR_SHIFT) |
1546                    (8 << 16) | (8 << 8) | (8 << 0));
1547         I915_WRITE(DSPFW2, (8 << 8) | (8 << 0));
1548         /* update cursor SR watermark */
1549         I915_WRITE(DSPFW3, (cursor_sr << DSPFW_CURSOR_SR_SHIFT));
1550 }
1551
1552 static void i9xx_update_wm(struct drm_crtc *unused_crtc)
1553 {
1554         struct drm_device *dev = unused_crtc->dev;
1555         struct drm_i915_private *dev_priv = dev->dev_private;
1556         const struct intel_watermark_params *wm_info;
1557         uint32_t fwater_lo;
1558         uint32_t fwater_hi;
1559         int cwm, srwm = 1;
1560         int fifo_size;
1561         int planea_wm, planeb_wm;
1562         struct drm_crtc *crtc, *enabled = NULL;
1563
1564         if (IS_I945GM(dev))
1565                 wm_info = &i945_wm_info;
1566         else if (!IS_GEN2(dev))
1567                 wm_info = &i915_wm_info;
1568         else
1569                 wm_info = &i855_wm_info;
1570
1571         fifo_size = dev_priv->display.get_fifo_size(dev, 0);
1572         crtc = intel_get_crtc_for_plane(dev, 0);
1573         if (intel_crtc_active(crtc)) {
1574                 const struct drm_display_mode *adjusted_mode;
1575                 int cpp = crtc->fb->bits_per_pixel / 8;
1576                 if (IS_GEN2(dev))
1577                         cpp = 4;
1578
1579                 adjusted_mode = &to_intel_crtc(crtc)->config.adjusted_mode;
1580                 planea_wm = intel_calculate_wm(adjusted_mode->crtc_clock,
1581                                                wm_info, fifo_size, cpp,
1582                                                latency_ns);
1583                 enabled = crtc;
1584         } else
1585                 planea_wm = fifo_size - wm_info->guard_size;
1586
1587         fifo_size = dev_priv->display.get_fifo_size(dev, 1);
1588         crtc = intel_get_crtc_for_plane(dev, 1);
1589         if (intel_crtc_active(crtc)) {
1590                 const struct drm_display_mode *adjusted_mode;
1591                 int cpp = crtc->fb->bits_per_pixel / 8;
1592                 if (IS_GEN2(dev))
1593                         cpp = 4;
1594
1595                 adjusted_mode = &to_intel_crtc(crtc)->config.adjusted_mode;
1596                 planeb_wm = intel_calculate_wm(adjusted_mode->crtc_clock,
1597                                                wm_info, fifo_size, cpp,
1598                                                latency_ns);
1599                 if (enabled == NULL)
1600                         enabled = crtc;
1601                 else
1602                         enabled = NULL;
1603         } else
1604                 planeb_wm = fifo_size - wm_info->guard_size;
1605
1606         DRM_DEBUG_KMS("FIFO watermarks - A: %d, B: %d\n", planea_wm, planeb_wm);
1607
1608         /*
1609          * Overlay gets an aggressive default since video jitter is bad.
1610          */
1611         cwm = 2;
1612
1613         /* Play safe and disable self-refresh before adjusting watermarks. */
1614         if (IS_I945G(dev) || IS_I945GM(dev))
1615                 I915_WRITE(FW_BLC_SELF, FW_BLC_SELF_EN_MASK | 0);
1616         else if (IS_I915GM(dev))
1617                 I915_WRITE(INSTPM, I915_READ(INSTPM) & ~INSTPM_SELF_EN);
1618
1619         /* Calc sr entries for one plane configs */
1620         if (HAS_FW_BLC(dev) && enabled) {
1621                 /* self-refresh has much higher latency */
1622                 static const int sr_latency_ns = 6000;
1623                 const struct drm_display_mode *adjusted_mode =
1624                         &to_intel_crtc(enabled)->config.adjusted_mode;
1625                 int clock = adjusted_mode->crtc_clock;
1626                 int htotal = adjusted_mode->htotal;
1627                 int hdisplay = to_intel_crtc(crtc)->config.pipe_src_w;
1628                 int pixel_size = enabled->fb->bits_per_pixel / 8;
1629                 unsigned long line_time_us;
1630                 int entries;
1631
1632                 line_time_us = (htotal * 1000) / clock;
1633
1634                 /* Use ns/us then divide to preserve precision */
1635                 entries = (((sr_latency_ns / line_time_us) + 1000) / 1000) *
1636                         pixel_size * hdisplay;
1637                 entries = DIV_ROUND_UP(entries, wm_info->cacheline_size);
1638                 DRM_DEBUG_KMS("self-refresh entries: %d\n", entries);
1639                 srwm = wm_info->fifo_size - entries;
1640                 if (srwm < 0)
1641                         srwm = 1;
1642
1643                 if (IS_I945G(dev) || IS_I945GM(dev))
1644                         I915_WRITE(FW_BLC_SELF,
1645                                    FW_BLC_SELF_FIFO_MASK | (srwm & 0xff));
1646                 else if (IS_I915GM(dev))
1647                         I915_WRITE(FW_BLC_SELF, srwm & 0x3f);
1648         }
1649
1650         DRM_DEBUG_KMS("Setting FIFO watermarks - A: %d, B: %d, C: %d, SR %d\n",
1651                       planea_wm, planeb_wm, cwm, srwm);
1652
1653         fwater_lo = ((planeb_wm & 0x3f) << 16) | (planea_wm & 0x3f);
1654         fwater_hi = (cwm & 0x1f);
1655
1656         /* Set request length to 8 cachelines per fetch */
1657         fwater_lo = fwater_lo | (1 << 24) | (1 << 8);
1658         fwater_hi = fwater_hi | (1 << 8);
1659
1660         I915_WRITE(FW_BLC, fwater_lo);
1661         I915_WRITE(FW_BLC2, fwater_hi);
1662
1663         if (HAS_FW_BLC(dev)) {
1664                 if (enabled) {
1665                         if (IS_I945G(dev) || IS_I945GM(dev))
1666                                 I915_WRITE(FW_BLC_SELF,
1667                                            FW_BLC_SELF_EN_MASK | FW_BLC_SELF_EN);
1668                         else if (IS_I915GM(dev))
1669                                 I915_WRITE(INSTPM, I915_READ(INSTPM) | INSTPM_SELF_EN);
1670                         DRM_DEBUG_KMS("memory self refresh enabled\n");
1671                 } else
1672                         DRM_DEBUG_KMS("memory self refresh disabled\n");
1673         }
1674 }
1675
1676 static void i830_update_wm(struct drm_crtc *unused_crtc)
1677 {
1678         struct drm_device *dev = unused_crtc->dev;
1679         struct drm_i915_private *dev_priv = dev->dev_private;
1680         struct drm_crtc *crtc;
1681         const struct drm_display_mode *adjusted_mode;
1682         uint32_t fwater_lo;
1683         int planea_wm;
1684
1685         crtc = single_enabled_crtc(dev);
1686         if (crtc == NULL)
1687                 return;
1688
1689         adjusted_mode = &to_intel_crtc(crtc)->config.adjusted_mode;
1690         planea_wm = intel_calculate_wm(adjusted_mode->crtc_clock,
1691                                        &i830_wm_info,
1692                                        dev_priv->display.get_fifo_size(dev, 0),
1693                                        4, latency_ns);
1694         fwater_lo = I915_READ(FW_BLC) & ~0xfff;
1695         fwater_lo |= (3<<8) | planea_wm;
1696
1697         DRM_DEBUG_KMS("Setting FIFO watermarks - A: %d\n", planea_wm);
1698
1699         I915_WRITE(FW_BLC, fwater_lo);
1700 }
1701
1702 /*
1703  * Check the wm result.
1704  *
1705  * If any calculated watermark values is larger than the maximum value that
1706  * can be programmed into the associated watermark register, that watermark
1707  * must be disabled.
1708  */
1709 static bool ironlake_check_srwm(struct drm_device *dev, int level,
1710                                 int fbc_wm, int display_wm, int cursor_wm,
1711                                 const struct intel_watermark_params *display,
1712                                 const struct intel_watermark_params *cursor)
1713 {
1714         struct drm_i915_private *dev_priv = dev->dev_private;
1715
1716         DRM_DEBUG_KMS("watermark %d: display plane %d, fbc lines %d,"
1717                       " cursor %d\n", level, display_wm, fbc_wm, cursor_wm);
1718
1719         if (fbc_wm > SNB_FBC_MAX_SRWM) {
1720                 DRM_DEBUG_KMS("fbc watermark(%d) is too large(%d), disabling wm%d+\n",
1721                               fbc_wm, SNB_FBC_MAX_SRWM, level);
1722
1723                 /* fbc has it's own way to disable FBC WM */
1724                 I915_WRITE(DISP_ARB_CTL,
1725                            I915_READ(DISP_ARB_CTL) | DISP_FBC_WM_DIS);
1726                 return false;
1727         } else if (INTEL_INFO(dev)->gen >= 6) {
1728                 /* enable FBC WM (except on ILK, where it must remain off) */
1729                 I915_WRITE(DISP_ARB_CTL,
1730                            I915_READ(DISP_ARB_CTL) & ~DISP_FBC_WM_DIS);
1731         }
1732
1733         if (display_wm > display->max_wm) {
1734                 DRM_DEBUG_KMS("display watermark(%d) is too large(%d), disabling wm%d+\n",
1735                               display_wm, SNB_DISPLAY_MAX_SRWM, level);
1736                 return false;
1737         }
1738
1739         if (cursor_wm > cursor->max_wm) {
1740                 DRM_DEBUG_KMS("cursor watermark(%d) is too large(%d), disabling wm%d+\n",
1741                               cursor_wm, SNB_CURSOR_MAX_SRWM, level);
1742                 return false;
1743         }
1744
1745         if (!(fbc_wm || display_wm || cursor_wm)) {
1746                 DRM_DEBUG_KMS("latency %d is 0, disabling wm%d+\n", level, level);
1747                 return false;
1748         }
1749
1750         return true;
1751 }
1752
1753 /*
1754  * Compute watermark values of WM[1-3],
1755  */
1756 static bool ironlake_compute_srwm(struct drm_device *dev, int level, int plane,
1757                                   int latency_ns,
1758                                   const struct intel_watermark_params *display,
1759                                   const struct intel_watermark_params *cursor,
1760                                   int *fbc_wm, int *display_wm, int *cursor_wm)
1761 {
1762         struct drm_crtc *crtc;
1763         const struct drm_display_mode *adjusted_mode;
1764         unsigned long line_time_us;
1765         int hdisplay, htotal, pixel_size, clock;
1766         int line_count, line_size;
1767         int small, large;
1768         int entries;
1769
1770         if (!latency_ns) {
1771                 *fbc_wm = *display_wm = *cursor_wm = 0;
1772                 return false;
1773         }
1774
1775         crtc = intel_get_crtc_for_plane(dev, plane);
1776         adjusted_mode = &to_intel_crtc(crtc)->config.adjusted_mode;
1777         clock = adjusted_mode->crtc_clock;
1778         htotal = adjusted_mode->htotal;
1779         hdisplay = to_intel_crtc(crtc)->config.pipe_src_w;
1780         pixel_size = crtc->fb->bits_per_pixel / 8;
1781
1782         line_time_us = (htotal * 1000) / clock;
1783         line_count = (latency_ns / line_time_us + 1000) / 1000;
1784         line_size = hdisplay * pixel_size;
1785
1786         /* Use the minimum of the small and large buffer method for primary */
1787         small = ((clock * pixel_size / 1000) * latency_ns) / 1000;
1788         large = line_count * line_size;
1789
1790         entries = DIV_ROUND_UP(min(small, large), display->cacheline_size);
1791         *display_wm = entries + display->guard_size;
1792
1793         /*
1794          * Spec says:
1795          * FBC WM = ((Final Primary WM * 64) / number of bytes per line) + 2
1796          */
1797         *fbc_wm = DIV_ROUND_UP(*display_wm * 64, line_size) + 2;
1798
1799         /* calculate the self-refresh watermark for display cursor */
1800         entries = line_count * pixel_size * 64;
1801         entries = DIV_ROUND_UP(entries, cursor->cacheline_size);
1802         *cursor_wm = entries + cursor->guard_size;
1803
1804         return ironlake_check_srwm(dev, level,
1805                                    *fbc_wm, *display_wm, *cursor_wm,
1806                                    display, cursor);
1807 }
1808
1809 static void ironlake_update_wm(struct drm_crtc *crtc)
1810 {
1811         struct drm_device *dev = crtc->dev;
1812         struct drm_i915_private *dev_priv = dev->dev_private;
1813         int fbc_wm, plane_wm, cursor_wm;
1814         unsigned int enabled;
1815
1816         enabled = 0;
1817         if (g4x_compute_wm0(dev, PIPE_A,
1818                             &ironlake_display_wm_info,
1819                             dev_priv->wm.pri_latency[0] * 100,
1820                             &ironlake_cursor_wm_info,
1821                             dev_priv->wm.cur_latency[0] * 100,
1822                             &plane_wm, &cursor_wm)) {
1823                 I915_WRITE(WM0_PIPEA_ILK,
1824                            (plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm);
1825                 DRM_DEBUG_KMS("FIFO watermarks For pipe A -"
1826                               " plane %d, " "cursor: %d\n",
1827                               plane_wm, cursor_wm);
1828                 enabled |= 1 << PIPE_A;
1829         }
1830
1831         if (g4x_compute_wm0(dev, PIPE_B,
1832                             &ironlake_display_wm_info,
1833                             dev_priv->wm.pri_latency[0] * 100,
1834                             &ironlake_cursor_wm_info,
1835                             dev_priv->wm.cur_latency[0] * 100,
1836                             &plane_wm, &cursor_wm)) {
1837                 I915_WRITE(WM0_PIPEB_ILK,
1838                            (plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm);
1839                 DRM_DEBUG_KMS("FIFO watermarks For pipe B -"
1840                               " plane %d, cursor: %d\n",
1841                               plane_wm, cursor_wm);
1842                 enabled |= 1 << PIPE_B;
1843         }
1844
1845         /*
1846          * Calculate and update the self-refresh watermark only when one
1847          * display plane is used.
1848          */
1849         I915_WRITE(WM3_LP_ILK, 0);
1850         I915_WRITE(WM2_LP_ILK, 0);
1851         I915_WRITE(WM1_LP_ILK, 0);
1852
1853         if (!single_plane_enabled(enabled))
1854                 return;
1855         enabled = ffs(enabled) - 1;
1856
1857         /* WM1 */
1858         if (!ironlake_compute_srwm(dev, 1, enabled,
1859                                    dev_priv->wm.pri_latency[1] * 500,
1860                                    &ironlake_display_srwm_info,
1861                                    &ironlake_cursor_srwm_info,
1862                                    &fbc_wm, &plane_wm, &cursor_wm))
1863                 return;
1864
1865         I915_WRITE(WM1_LP_ILK,
1866                    WM1_LP_SR_EN |
1867                    (dev_priv->wm.pri_latency[1] << WM1_LP_LATENCY_SHIFT) |
1868                    (fbc_wm << WM1_LP_FBC_SHIFT) |
1869                    (plane_wm << WM1_LP_SR_SHIFT) |
1870                    cursor_wm);
1871
1872         /* WM2 */
1873         if (!ironlake_compute_srwm(dev, 2, enabled,
1874                                    dev_priv->wm.pri_latency[2] * 500,
1875                                    &ironlake_display_srwm_info,
1876                                    &ironlake_cursor_srwm_info,
1877                                    &fbc_wm, &plane_wm, &cursor_wm))
1878                 return;
1879
1880         I915_WRITE(WM2_LP_ILK,
1881                    WM2_LP_EN |
1882                    (dev_priv->wm.pri_latency[2] << WM1_LP_LATENCY_SHIFT) |
1883                    (fbc_wm << WM1_LP_FBC_SHIFT) |
1884                    (plane_wm << WM1_LP_SR_SHIFT) |
1885                    cursor_wm);
1886
1887         /*
1888          * WM3 is unsupported on ILK, probably because we don't have latency
1889          * data for that power state
1890          */
1891 }
1892
1893 static void sandybridge_update_wm(struct drm_crtc *crtc)
1894 {
1895         struct drm_device *dev = crtc->dev;
1896         struct drm_i915_private *dev_priv = dev->dev_private;
1897         int latency = dev_priv->wm.pri_latency[0] * 100;        /* In unit 0.1us */
1898         u32 val;
1899         int fbc_wm, plane_wm, cursor_wm;
1900         unsigned int enabled;
1901
1902         enabled = 0;
1903         if (g4x_compute_wm0(dev, PIPE_A,
1904                             &sandybridge_display_wm_info, latency,
1905                             &sandybridge_cursor_wm_info, latency,
1906                             &plane_wm, &cursor_wm)) {
1907                 val = I915_READ(WM0_PIPEA_ILK);
1908                 val &= ~(WM0_PIPE_PLANE_MASK | WM0_PIPE_CURSOR_MASK);
1909                 I915_WRITE(WM0_PIPEA_ILK, val |
1910                            ((plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm));
1911                 DRM_DEBUG_KMS("FIFO watermarks For pipe A -"
1912                               " plane %d, " "cursor: %d\n",
1913                               plane_wm, cursor_wm);
1914                 enabled |= 1 << PIPE_A;
1915         }
1916
1917         if (g4x_compute_wm0(dev, PIPE_B,
1918                             &sandybridge_display_wm_info, latency,
1919                             &sandybridge_cursor_wm_info, latency,
1920                             &plane_wm, &cursor_wm)) {
1921                 val = I915_READ(WM0_PIPEB_ILK);
1922                 val &= ~(WM0_PIPE_PLANE_MASK | WM0_PIPE_CURSOR_MASK);
1923                 I915_WRITE(WM0_PIPEB_ILK, val |
1924                            ((plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm));
1925                 DRM_DEBUG_KMS("FIFO watermarks For pipe B -"
1926                               " plane %d, cursor: %d\n",
1927                               plane_wm, cursor_wm);
1928                 enabled |= 1 << PIPE_B;
1929         }
1930
1931         /*
1932          * Calculate and update the self-refresh watermark only when one
1933          * display plane is used.
1934          *
1935          * SNB support 3 levels of watermark.
1936          *
1937          * WM1/WM2/WM2 watermarks have to be enabled in the ascending order,
1938          * and disabled in the descending order
1939          *
1940          */
1941         I915_WRITE(WM3_LP_ILK, 0);
1942         I915_WRITE(WM2_LP_ILK, 0);
1943         I915_WRITE(WM1_LP_ILK, 0);
1944
1945         if (!single_plane_enabled(enabled) ||
1946             dev_priv->sprite_scaling_enabled)
1947                 return;
1948         enabled = ffs(enabled) - 1;
1949
1950         /* WM1 */
1951         if (!ironlake_compute_srwm(dev, 1, enabled,
1952                                    dev_priv->wm.pri_latency[1] * 500,
1953                                    &sandybridge_display_srwm_info,
1954                                    &sandybridge_cursor_srwm_info,
1955                                    &fbc_wm, &plane_wm, &cursor_wm))
1956                 return;
1957
1958         I915_WRITE(WM1_LP_ILK,
1959                    WM1_LP_SR_EN |
1960                    (dev_priv->wm.pri_latency[1] << WM1_LP_LATENCY_SHIFT) |
1961                    (fbc_wm << WM1_LP_FBC_SHIFT) |
1962                    (plane_wm << WM1_LP_SR_SHIFT) |
1963                    cursor_wm);
1964
1965         /* WM2 */
1966         if (!ironlake_compute_srwm(dev, 2, enabled,
1967                                    dev_priv->wm.pri_latency[2] * 500,
1968                                    &sandybridge_display_srwm_info,
1969                                    &sandybridge_cursor_srwm_info,
1970                                    &fbc_wm, &plane_wm, &cursor_wm))
1971                 return;
1972
1973         I915_WRITE(WM2_LP_ILK,
1974                    WM2_LP_EN |
1975                    (dev_priv->wm.pri_latency[2] << WM1_LP_LATENCY_SHIFT) |
1976                    (fbc_wm << WM1_LP_FBC_SHIFT) |
1977                    (plane_wm << WM1_LP_SR_SHIFT) |
1978                    cursor_wm);
1979
1980         /* WM3 */
1981         if (!ironlake_compute_srwm(dev, 3, enabled,
1982                                    dev_priv->wm.pri_latency[3] * 500,
1983                                    &sandybridge_display_srwm_info,
1984                                    &sandybridge_cursor_srwm_info,
1985                                    &fbc_wm, &plane_wm, &cursor_wm))
1986                 return;
1987
1988         I915_WRITE(WM3_LP_ILK,
1989                    WM3_LP_EN |
1990                    (dev_priv->wm.pri_latency[3] << WM1_LP_LATENCY_SHIFT) |
1991                    (fbc_wm << WM1_LP_FBC_SHIFT) |
1992                    (plane_wm << WM1_LP_SR_SHIFT) |
1993                    cursor_wm);
1994 }
1995
1996 static void ivybridge_update_wm(struct drm_crtc *crtc)
1997 {
1998         struct drm_device *dev = crtc->dev;
1999         struct drm_i915_private *dev_priv = dev->dev_private;
2000         int latency = dev_priv->wm.pri_latency[0] * 100;        /* In unit 0.1us */
2001         u32 val;
2002         int fbc_wm, plane_wm, cursor_wm;
2003         int ignore_fbc_wm, ignore_plane_wm, ignore_cursor_wm;
2004         unsigned int enabled;
2005
2006         enabled = 0;
2007         if (g4x_compute_wm0(dev, PIPE_A,
2008                             &sandybridge_display_wm_info, latency,
2009                             &sandybridge_cursor_wm_info, latency,
2010                             &plane_wm, &cursor_wm)) {
2011                 val = I915_READ(WM0_PIPEA_ILK);
2012                 val &= ~(WM0_PIPE_PLANE_MASK | WM0_PIPE_CURSOR_MASK);
2013                 I915_WRITE(WM0_PIPEA_ILK, val |
2014                            ((plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm));
2015                 DRM_DEBUG_KMS("FIFO watermarks For pipe A -"
2016                               " plane %d, " "cursor: %d\n",
2017                               plane_wm, cursor_wm);
2018                 enabled |= 1 << PIPE_A;
2019         }
2020
2021         if (g4x_compute_wm0(dev, PIPE_B,
2022                             &sandybridge_display_wm_info, latency,
2023                             &sandybridge_cursor_wm_info, latency,
2024                             &plane_wm, &cursor_wm)) {
2025                 val = I915_READ(WM0_PIPEB_ILK);
2026                 val &= ~(WM0_PIPE_PLANE_MASK | WM0_PIPE_CURSOR_MASK);
2027                 I915_WRITE(WM0_PIPEB_ILK, val |
2028                            ((plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm));
2029                 DRM_DEBUG_KMS("FIFO watermarks For pipe B -"
2030                               " plane %d, cursor: %d\n",
2031                               plane_wm, cursor_wm);
2032                 enabled |= 1 << PIPE_B;
2033         }
2034
2035         if (g4x_compute_wm0(dev, PIPE_C,
2036                             &sandybridge_display_wm_info, latency,
2037                             &sandybridge_cursor_wm_info, latency,
2038                             &plane_wm, &cursor_wm)) {
2039                 val = I915_READ(WM0_PIPEC_IVB);
2040                 val &= ~(WM0_PIPE_PLANE_MASK | WM0_PIPE_CURSOR_MASK);
2041                 I915_WRITE(WM0_PIPEC_IVB, val |
2042                            ((plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm));
2043                 DRM_DEBUG_KMS("FIFO watermarks For pipe C -"
2044                               " plane %d, cursor: %d\n",
2045                               plane_wm, cursor_wm);
2046                 enabled |= 1 << PIPE_C;
2047         }
2048
2049         /*
2050          * Calculate and update the self-refresh watermark only when one
2051          * display plane is used.
2052          *
2053          * SNB support 3 levels of watermark.
2054          *
2055          * WM1/WM2/WM2 watermarks have to be enabled in the ascending order,
2056          * and disabled in the descending order
2057          *
2058          */
2059         I915_WRITE(WM3_LP_ILK, 0);
2060         I915_WRITE(WM2_LP_ILK, 0);
2061         I915_WRITE(WM1_LP_ILK, 0);
2062
2063         if (!single_plane_enabled(enabled) ||
2064             dev_priv->sprite_scaling_enabled)
2065                 return;
2066         enabled = ffs(enabled) - 1;
2067
2068         /* WM1 */
2069         if (!ironlake_compute_srwm(dev, 1, enabled,
2070                                    dev_priv->wm.pri_latency[1] * 500,
2071                                    &sandybridge_display_srwm_info,
2072                                    &sandybridge_cursor_srwm_info,
2073                                    &fbc_wm, &plane_wm, &cursor_wm))
2074                 return;
2075
2076         I915_WRITE(WM1_LP_ILK,
2077                    WM1_LP_SR_EN |
2078                    (dev_priv->wm.pri_latency[1] << WM1_LP_LATENCY_SHIFT) |
2079                    (fbc_wm << WM1_LP_FBC_SHIFT) |
2080                    (plane_wm << WM1_LP_SR_SHIFT) |
2081                    cursor_wm);
2082
2083         /* WM2 */
2084         if (!ironlake_compute_srwm(dev, 2, enabled,
2085                                    dev_priv->wm.pri_latency[2] * 500,
2086                                    &sandybridge_display_srwm_info,
2087                                    &sandybridge_cursor_srwm_info,
2088                                    &fbc_wm, &plane_wm, &cursor_wm))
2089                 return;
2090
2091         I915_WRITE(WM2_LP_ILK,
2092                    WM2_LP_EN |
2093                    (dev_priv->wm.pri_latency[2] << WM1_LP_LATENCY_SHIFT) |
2094                    (fbc_wm << WM1_LP_FBC_SHIFT) |
2095                    (plane_wm << WM1_LP_SR_SHIFT) |
2096                    cursor_wm);
2097
2098         /* WM3, note we have to correct the cursor latency */
2099         if (!ironlake_compute_srwm(dev, 3, enabled,
2100                                    dev_priv->wm.pri_latency[3] * 500,
2101                                    &sandybridge_display_srwm_info,
2102                                    &sandybridge_cursor_srwm_info,
2103                                    &fbc_wm, &plane_wm, &ignore_cursor_wm) ||
2104             !ironlake_compute_srwm(dev, 3, enabled,
2105                                    dev_priv->wm.cur_latency[3] * 500,
2106                                    &sandybridge_display_srwm_info,
2107                                    &sandybridge_cursor_srwm_info,
2108                                    &ignore_fbc_wm, &ignore_plane_wm, &cursor_wm))
2109                 return;
2110
2111         I915_WRITE(WM3_LP_ILK,
2112                    WM3_LP_EN |
2113                    (dev_priv->wm.pri_latency[3] << WM1_LP_LATENCY_SHIFT) |
2114                    (fbc_wm << WM1_LP_FBC_SHIFT) |
2115                    (plane_wm << WM1_LP_SR_SHIFT) |
2116                    cursor_wm);
2117 }
2118
2119 static uint32_t ilk_pipe_pixel_rate(struct drm_device *dev,
2120                                     struct drm_crtc *crtc)
2121 {
2122         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
2123         uint32_t pixel_rate;
2124
2125         pixel_rate = intel_crtc->config.adjusted_mode.crtc_clock;
2126
2127         /* We only use IF-ID interlacing. If we ever use PF-ID we'll need to
2128          * adjust the pixel_rate here. */
2129
2130         if (intel_crtc->config.pch_pfit.enabled) {
2131                 uint64_t pipe_w, pipe_h, pfit_w, pfit_h;
2132                 uint32_t pfit_size = intel_crtc->config.pch_pfit.size;
2133
2134                 pipe_w = intel_crtc->config.pipe_src_w;
2135                 pipe_h = intel_crtc->config.pipe_src_h;
2136                 pfit_w = (pfit_size >> 16) & 0xFFFF;
2137                 pfit_h = pfit_size & 0xFFFF;
2138                 if (pipe_w < pfit_w)
2139                         pipe_w = pfit_w;
2140                 if (pipe_h < pfit_h)
2141                         pipe_h = pfit_h;
2142
2143                 pixel_rate = div_u64((uint64_t) pixel_rate * pipe_w * pipe_h,
2144                                      pfit_w * pfit_h);
2145         }
2146
2147         return pixel_rate;
2148 }
2149
2150 /* latency must be in 0.1us units. */
2151 static uint32_t ilk_wm_method1(uint32_t pixel_rate, uint8_t bytes_per_pixel,
2152                                uint32_t latency)
2153 {
2154         uint64_t ret;
2155
2156         if (WARN(latency == 0, "Latency value missing\n"))
2157                 return UINT_MAX;
2158
2159         ret = (uint64_t) pixel_rate * bytes_per_pixel * latency;
2160         ret = DIV_ROUND_UP_ULL(ret, 64 * 10000) + 2;
2161
2162         return ret;
2163 }
2164
2165 /* latency must be in 0.1us units. */
2166 static uint32_t ilk_wm_method2(uint32_t pixel_rate, uint32_t pipe_htotal,
2167                                uint32_t horiz_pixels, uint8_t bytes_per_pixel,
2168                                uint32_t latency)
2169 {
2170         uint32_t ret;
2171
2172         if (WARN(latency == 0, "Latency value missing\n"))
2173                 return UINT_MAX;
2174
2175         ret = (latency * pixel_rate) / (pipe_htotal * 10000);
2176         ret = (ret + 1) * horiz_pixels * bytes_per_pixel;
2177         ret = DIV_ROUND_UP(ret, 64) + 2;
2178         return ret;
2179 }
2180
2181 static uint32_t ilk_wm_fbc(uint32_t pri_val, uint32_t horiz_pixels,
2182                            uint8_t bytes_per_pixel)
2183 {
2184         return DIV_ROUND_UP(pri_val * 64, horiz_pixels * bytes_per_pixel) + 2;
2185 }
2186
2187 struct hsw_pipe_wm_parameters {
2188         bool active;
2189         uint32_t pipe_htotal;
2190         uint32_t pixel_rate;
2191         struct intel_plane_wm_parameters pri;
2192         struct intel_plane_wm_parameters spr;
2193         struct intel_plane_wm_parameters cur;
2194 };
2195
2196 struct hsw_wm_maximums {
2197         uint16_t pri;
2198         uint16_t spr;
2199         uint16_t cur;
2200         uint16_t fbc;
2201 };
2202
2203 struct hsw_wm_values {
2204         uint32_t wm_pipe[3];
2205         uint32_t wm_lp[3];
2206         uint32_t wm_lp_spr[3];
2207         uint32_t wm_linetime[3];
2208         bool enable_fbc_wm;
2209 };
2210
2211 /* used in computing the new watermarks state */
2212 struct intel_wm_config {
2213         unsigned int num_pipes_active;
2214         bool sprites_enabled;
2215         bool sprites_scaled;
2216         bool fbc_wm_enabled;
2217 };
2218
2219 /*
2220  * For both WM_PIPE and WM_LP.
2221  * mem_value must be in 0.1us units.
2222  */
2223 static uint32_t ilk_compute_pri_wm(const struct hsw_pipe_wm_parameters *params,
2224                                    uint32_t mem_value,
2225                                    bool is_lp)
2226 {
2227         uint32_t method1, method2;
2228
2229         if (!params->active || !params->pri.enabled)
2230                 return 0;
2231
2232         method1 = ilk_wm_method1(params->pixel_rate,
2233                                  params->pri.bytes_per_pixel,
2234                                  mem_value);
2235
2236         if (!is_lp)
2237                 return method1;
2238
2239         method2 = ilk_wm_method2(params->pixel_rate,
2240                                  params->pipe_htotal,
2241                                  params->pri.horiz_pixels,
2242                                  params->pri.bytes_per_pixel,
2243                                  mem_value);
2244
2245         return min(method1, method2);
2246 }
2247
2248 /*
2249  * For both WM_PIPE and WM_LP.
2250  * mem_value must be in 0.1us units.
2251  */
2252 static uint32_t ilk_compute_spr_wm(const struct hsw_pipe_wm_parameters *params,
2253                                    uint32_t mem_value)
2254 {
2255         uint32_t method1, method2;
2256
2257         if (!params->active || !params->spr.enabled)
2258                 return 0;
2259
2260         method1 = ilk_wm_method1(params->pixel_rate,
2261                                  params->spr.bytes_per_pixel,
2262                                  mem_value);
2263         method2 = ilk_wm_method2(params->pixel_rate,
2264                                  params->pipe_htotal,
2265                                  params->spr.horiz_pixels,
2266                                  params->spr.bytes_per_pixel,
2267                                  mem_value);
2268         return min(method1, method2);
2269 }
2270
2271 /*
2272  * For both WM_PIPE and WM_LP.
2273  * mem_value must be in 0.1us units.
2274  */
2275 static uint32_t ilk_compute_cur_wm(const struct hsw_pipe_wm_parameters *params,
2276                                    uint32_t mem_value)
2277 {
2278         if (!params->active || !params->cur.enabled)
2279                 return 0;
2280
2281         return ilk_wm_method2(params->pixel_rate,
2282                               params->pipe_htotal,
2283                               params->cur.horiz_pixels,
2284                               params->cur.bytes_per_pixel,
2285                               mem_value);
2286 }
2287
2288 /* Only for WM_LP. */
2289 static uint32_t ilk_compute_fbc_wm(const struct hsw_pipe_wm_parameters *params,
2290                                    uint32_t pri_val)
2291 {
2292         if (!params->active || !params->pri.enabled)
2293                 return 0;
2294
2295         return ilk_wm_fbc(pri_val,
2296                           params->pri.horiz_pixels,
2297                           params->pri.bytes_per_pixel);
2298 }
2299
2300 static unsigned int ilk_display_fifo_size(const struct drm_device *dev)
2301 {
2302         if (INTEL_INFO(dev)->gen >= 7)
2303                 return 768;
2304         else
2305                 return 512;
2306 }
2307
2308 /* Calculate the maximum primary/sprite plane watermark */
2309 static unsigned int ilk_plane_wm_max(const struct drm_device *dev,
2310                                      int level,
2311                                      const struct intel_wm_config *config,
2312                                      enum intel_ddb_partitioning ddb_partitioning,
2313                                      bool is_sprite)
2314 {
2315         unsigned int fifo_size = ilk_display_fifo_size(dev);
2316         unsigned int max;
2317
2318         /* if sprites aren't enabled, sprites get nothing */
2319         if (is_sprite && !config->sprites_enabled)
2320                 return 0;
2321
2322         /* HSW allows LP1+ watermarks even with multiple pipes */
2323         if (level == 0 || config->num_pipes_active > 1) {
2324                 fifo_size /= INTEL_INFO(dev)->num_pipes;
2325
2326                 /*
2327                  * For some reason the non self refresh
2328                  * FIFO size is only half of the self
2329                  * refresh FIFO size on ILK/SNB.
2330                  */
2331                 if (INTEL_INFO(dev)->gen <= 6)
2332                         fifo_size /= 2;
2333         }
2334
2335         if (config->sprites_enabled) {
2336                 /* level 0 is always calculated with 1:1 split */
2337                 if (level > 0 && ddb_partitioning == INTEL_DDB_PART_5_6) {
2338                         if (is_sprite)
2339                                 fifo_size *= 5;
2340                         fifo_size /= 6;
2341                 } else {
2342                         fifo_size /= 2;
2343                 }
2344         }
2345
2346         /* clamp to max that the registers can hold */
2347         if (INTEL_INFO(dev)->gen >= 7)
2348                 /* IVB/HSW primary/sprite plane watermarks */
2349                 max = level == 0 ? 127 : 1023;
2350         else if (!is_sprite)
2351                 /* ILK/SNB primary plane watermarks */
2352                 max = level == 0 ? 127 : 511;
2353         else
2354                 /* ILK/SNB sprite plane watermarks */
2355                 max = level == 0 ? 63 : 255;
2356
2357         return min(fifo_size, max);
2358 }
2359
2360 /* Calculate the maximum cursor plane watermark */
2361 static unsigned int ilk_cursor_wm_max(const struct drm_device *dev,
2362                                       int level,
2363                                       const struct intel_wm_config *config)
2364 {
2365         /* HSW LP1+ watermarks w/ multiple pipes */
2366         if (level > 0 && config->num_pipes_active > 1)
2367                 return 64;
2368
2369         /* otherwise just report max that registers can hold */
2370         if (INTEL_INFO(dev)->gen >= 7)
2371                 return level == 0 ? 63 : 255;
2372         else
2373                 return level == 0 ? 31 : 63;
2374 }
2375
2376 /* Calculate the maximum FBC watermark */
2377 static unsigned int ilk_fbc_wm_max(void)
2378 {
2379         /* max that registers can hold */
2380         return 15;
2381 }
2382
2383 static void ilk_wm_max(struct drm_device *dev,
2384                        int level,
2385                        const struct intel_wm_config *config,
2386                        enum intel_ddb_partitioning ddb_partitioning,
2387                        struct hsw_wm_maximums *max)
2388 {
2389         max->pri = ilk_plane_wm_max(dev, level, config, ddb_partitioning, false);
2390         max->spr = ilk_plane_wm_max(dev, level, config, ddb_partitioning, true);
2391         max->cur = ilk_cursor_wm_max(dev, level, config);
2392         max->fbc = ilk_fbc_wm_max();
2393 }
2394
2395 static bool ilk_check_wm(int level,
2396                          const struct hsw_wm_maximums *max,
2397                          struct intel_wm_level *result)
2398 {
2399         bool ret;
2400
2401         /* already determined to be invalid? */
2402         if (!result->enable)
2403                 return false;
2404
2405         result->enable = result->pri_val <= max->pri &&
2406                          result->spr_val <= max->spr &&
2407                          result->cur_val <= max->cur;
2408
2409         ret = result->enable;
2410
2411         /*
2412          * HACK until we can pre-compute everything,
2413          * and thus fail gracefully if LP0 watermarks
2414          * are exceeded...
2415          */
2416         if (level == 0 && !result->enable) {
2417                 if (result->pri_val > max->pri)
2418                         DRM_DEBUG_KMS("Primary WM%d too large %u (max %u)\n",
2419                                       level, result->pri_val, max->pri);
2420                 if (result->spr_val > max->spr)
2421                         DRM_DEBUG_KMS("Sprite WM%d too large %u (max %u)\n",
2422                                       level, result->spr_val, max->spr);
2423                 if (result->cur_val > max->cur)
2424                         DRM_DEBUG_KMS("Cursor WM%d too large %u (max %u)\n",
2425                                       level, result->cur_val, max->cur);
2426
2427                 result->pri_val = min_t(uint32_t, result->pri_val, max->pri);
2428                 result->spr_val = min_t(uint32_t, result->spr_val, max->spr);
2429                 result->cur_val = min_t(uint32_t, result->cur_val, max->cur);
2430                 result->enable = true;
2431         }
2432
2433         DRM_DEBUG_KMS("WM%d: %sabled\n", level, result->enable ? "en" : "dis");
2434
2435         return ret;
2436 }
2437
2438 static void ilk_compute_wm_level(struct drm_i915_private *dev_priv,
2439                                  int level,
2440                                  const struct hsw_pipe_wm_parameters *p,
2441                                  struct intel_wm_level *result)
2442 {
2443         uint16_t pri_latency = dev_priv->wm.pri_latency[level];
2444         uint16_t spr_latency = dev_priv->wm.spr_latency[level];
2445         uint16_t cur_latency = dev_priv->wm.cur_latency[level];
2446
2447         /* WM1+ latency values stored in 0.5us units */
2448         if (level > 0) {
2449                 pri_latency *= 5;
2450                 spr_latency *= 5;
2451                 cur_latency *= 5;
2452         }
2453
2454         result->pri_val = ilk_compute_pri_wm(p, pri_latency, level);
2455         result->spr_val = ilk_compute_spr_wm(p, spr_latency);
2456         result->cur_val = ilk_compute_cur_wm(p, cur_latency);
2457         result->fbc_val = ilk_compute_fbc_wm(p, result->pri_val);
2458         result->enable = true;
2459 }
2460
2461 static uint32_t
2462 hsw_compute_linetime_wm(struct drm_device *dev, struct drm_crtc *crtc)
2463 {
2464         struct drm_i915_private *dev_priv = dev->dev_private;
2465         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
2466         struct drm_display_mode *mode = &intel_crtc->config.adjusted_mode;
2467         u32 linetime, ips_linetime;
2468
2469         if (!intel_crtc_active(crtc))
2470                 return 0;
2471
2472         /* The WM are computed with base on how long it takes to fill a single
2473          * row at the given clock rate, multiplied by 8.
2474          * */
2475         linetime = DIV_ROUND_CLOSEST(mode->htotal * 1000 * 8, mode->clock);
2476         ips_linetime = DIV_ROUND_CLOSEST(mode->htotal * 1000 * 8,
2477                                          intel_ddi_get_cdclk_freq(dev_priv));
2478
2479         return PIPE_WM_LINETIME_IPS_LINETIME(ips_linetime) |
2480                PIPE_WM_LINETIME_TIME(linetime);
2481 }
2482
2483 static void intel_read_wm_latency(struct drm_device *dev, uint16_t wm[5])
2484 {
2485         struct drm_i915_private *dev_priv = dev->dev_private;
2486
2487         if (IS_HASWELL(dev)) {
2488                 uint64_t sskpd = I915_READ64(MCH_SSKPD);
2489
2490                 wm[0] = (sskpd >> 56) & 0xFF;
2491                 if (wm[0] == 0)
2492                         wm[0] = sskpd & 0xF;
2493                 wm[1] = (sskpd >> 4) & 0xFF;
2494                 wm[2] = (sskpd >> 12) & 0xFF;
2495                 wm[3] = (sskpd >> 20) & 0x1FF;
2496                 wm[4] = (sskpd >> 32) & 0x1FF;
2497         } else if (INTEL_INFO(dev)->gen >= 6) {
2498                 uint32_t sskpd = I915_READ(MCH_SSKPD);
2499
2500                 wm[0] = (sskpd >> SSKPD_WM0_SHIFT) & SSKPD_WM_MASK;
2501                 wm[1] = (sskpd >> SSKPD_WM1_SHIFT) & SSKPD_WM_MASK;
2502                 wm[2] = (sskpd >> SSKPD_WM2_SHIFT) & SSKPD_WM_MASK;
2503                 wm[3] = (sskpd >> SSKPD_WM3_SHIFT) & SSKPD_WM_MASK;
2504         } else if (INTEL_INFO(dev)->gen >= 5) {
2505                 uint32_t mltr = I915_READ(MLTR_ILK);
2506
2507                 /* ILK primary LP0 latency is 700 ns */
2508                 wm[0] = 7;
2509                 wm[1] = (mltr >> MLTR_WM1_SHIFT) & ILK_SRLT_MASK;
2510                 wm[2] = (mltr >> MLTR_WM2_SHIFT) & ILK_SRLT_MASK;
2511         }
2512 }
2513
2514 static void intel_fixup_spr_wm_latency(struct drm_device *dev, uint16_t wm[5])
2515 {
2516         /* ILK sprite LP0 latency is 1300 ns */
2517         if (INTEL_INFO(dev)->gen == 5)
2518                 wm[0] = 13;
2519 }
2520
2521 static void intel_fixup_cur_wm_latency(struct drm_device *dev, uint16_t wm[5])
2522 {
2523         /* ILK cursor LP0 latency is 1300 ns */
2524         if (INTEL_INFO(dev)->gen == 5)
2525                 wm[0] = 13;
2526
2527         /* WaDoubleCursorLP3Latency:ivb */
2528         if (IS_IVYBRIDGE(dev))
2529                 wm[3] *= 2;
2530 }
2531
2532 static int ilk_wm_max_level(const struct drm_device *dev)
2533 {
2534         /* how many WM levels are we expecting */
2535         if (IS_HASWELL(dev))
2536                 return 4;
2537         else if (INTEL_INFO(dev)->gen >= 6)
2538                 return 3;
2539         else
2540                 return 2;
2541 }
2542
2543 static void intel_print_wm_latency(struct drm_device *dev,
2544                                    const char *name,
2545                                    const uint16_t wm[5])
2546 {
2547         int level, max_level = ilk_wm_max_level(dev);
2548
2549         for (level = 0; level <= max_level; level++) {
2550                 unsigned int latency = wm[level];
2551
2552                 if (latency == 0) {
2553                         DRM_ERROR("%s WM%d latency not provided\n",
2554                                   name, level);
2555                         continue;
2556                 }
2557
2558                 /* WM1+ latency values in 0.5us units */
2559                 if (level > 0)
2560                         latency *= 5;
2561
2562                 DRM_DEBUG_KMS("%s WM%d latency %u (%u.%u usec)\n",
2563                               name, level, wm[level],
2564                               latency / 10, latency % 10);
2565         }
2566 }
2567
2568 static void intel_setup_wm_latency(struct drm_device *dev)
2569 {
2570         struct drm_i915_private *dev_priv = dev->dev_private;
2571
2572         intel_read_wm_latency(dev, dev_priv->wm.pri_latency);
2573
2574         memcpy(dev_priv->wm.spr_latency, dev_priv->wm.pri_latency,
2575                sizeof(dev_priv->wm.pri_latency));
2576         memcpy(dev_priv->wm.cur_latency, dev_priv->wm.pri_latency,
2577                sizeof(dev_priv->wm.pri_latency));
2578
2579         intel_fixup_spr_wm_latency(dev, dev_priv->wm.spr_latency);
2580         intel_fixup_cur_wm_latency(dev, dev_priv->wm.cur_latency);
2581
2582         intel_print_wm_latency(dev, "Primary", dev_priv->wm.pri_latency);
2583         intel_print_wm_latency(dev, "Sprite", dev_priv->wm.spr_latency);
2584         intel_print_wm_latency(dev, "Cursor", dev_priv->wm.cur_latency);
2585 }
2586
2587 static void hsw_compute_wm_parameters(struct drm_crtc *crtc,
2588                                       struct hsw_pipe_wm_parameters *p,
2589                                       struct intel_wm_config *config)
2590 {
2591         struct drm_device *dev = crtc->dev;
2592         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
2593         enum pipe pipe = intel_crtc->pipe;
2594         struct drm_plane *plane;
2595
2596         p->active = intel_crtc_active(crtc);
2597         if (p->active) {
2598                 p->pipe_htotal = intel_crtc->config.adjusted_mode.htotal;
2599                 p->pixel_rate = ilk_pipe_pixel_rate(dev, crtc);
2600                 p->pri.bytes_per_pixel = crtc->fb->bits_per_pixel / 8;
2601                 p->cur.bytes_per_pixel = 4;
2602                 p->pri.horiz_pixels = intel_crtc->config.pipe_src_w;
2603                 p->cur.horiz_pixels = 64;
2604                 /* TODO: for now, assume primary and cursor planes are always enabled. */
2605                 p->pri.enabled = true;
2606                 p->cur.enabled = true;
2607         }
2608
2609         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
2610                 config->num_pipes_active += intel_crtc_active(crtc);
2611
2612         list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
2613                 struct intel_plane *intel_plane = to_intel_plane(plane);
2614
2615                 if (intel_plane->pipe == pipe)
2616                         p->spr = intel_plane->wm;
2617
2618                 config->sprites_enabled |= intel_plane->wm.enabled;
2619                 config->sprites_scaled |= intel_plane->wm.scaled;
2620         }
2621 }
2622
2623 /* Compute new watermarks for the pipe */
2624 static bool intel_compute_pipe_wm(struct drm_crtc *crtc,
2625                                   const struct hsw_pipe_wm_parameters *params,
2626                                   struct intel_pipe_wm *pipe_wm)
2627 {
2628         struct drm_device *dev = crtc->dev;
2629         struct drm_i915_private *dev_priv = dev->dev_private;
2630         int level, max_level = ilk_wm_max_level(dev);
2631         /* LP0 watermark maximums depend on this pipe alone */
2632         struct intel_wm_config config = {
2633                 .num_pipes_active = 1,
2634                 .sprites_enabled = params->spr.enabled,
2635                 .sprites_scaled = params->spr.scaled,
2636         };
2637         struct hsw_wm_maximums max;
2638
2639         /* LP0 watermarks always use 1/2 DDB partitioning */
2640         ilk_wm_max(dev, 0, &config, INTEL_DDB_PART_1_2, &max);
2641
2642         for (level = 0; level <= max_level; level++)
2643                 ilk_compute_wm_level(dev_priv, level, params,
2644                                      &pipe_wm->wm[level]);
2645
2646         pipe_wm->linetime = hsw_compute_linetime_wm(dev, crtc);
2647
2648         /* At least LP0 must be valid */
2649         return ilk_check_wm(0, &max, &pipe_wm->wm[0]);
2650 }
2651
2652 /*
2653  * Merge the watermarks from all active pipes for a specific level.
2654  */
2655 static void ilk_merge_wm_level(struct drm_device *dev,
2656                                int level,
2657                                struct intel_wm_level *ret_wm)
2658 {
2659         const struct intel_crtc *intel_crtc;
2660
2661         list_for_each_entry(intel_crtc, &dev->mode_config.crtc_list, base.head) {
2662                 const struct intel_wm_level *wm =
2663                         &intel_crtc->wm.active.wm[level];
2664
2665                 if (!wm->enable)
2666                         return;
2667
2668                 ret_wm->pri_val = max(ret_wm->pri_val, wm->pri_val);
2669                 ret_wm->spr_val = max(ret_wm->spr_val, wm->spr_val);
2670                 ret_wm->cur_val = max(ret_wm->cur_val, wm->cur_val);
2671                 ret_wm->fbc_val = max(ret_wm->fbc_val, wm->fbc_val);
2672         }
2673
2674         ret_wm->enable = true;
2675 }
2676
2677 /*
2678  * Merge all low power watermarks for all active pipes.
2679  */
2680 static void ilk_wm_merge(struct drm_device *dev,
2681                          const struct hsw_wm_maximums *max,
2682                          struct intel_pipe_wm *merged)
2683 {
2684         int level, max_level = ilk_wm_max_level(dev);
2685
2686         merged->fbc_wm_enabled = true;
2687
2688         /* merge each WM1+ level */
2689         for (level = 1; level <= max_level; level++) {
2690                 struct intel_wm_level *wm = &merged->wm[level];
2691
2692                 ilk_merge_wm_level(dev, level, wm);
2693
2694                 if (!ilk_check_wm(level, max, wm))
2695                         break;
2696
2697                 /*
2698                  * The spec says it is preferred to disable
2699                  * FBC WMs instead of disabling a WM level.
2700                  */
2701                 if (wm->fbc_val > max->fbc) {
2702                         merged->fbc_wm_enabled = false;
2703                         wm->fbc_val = 0;
2704                 }
2705         }
2706 }
2707
2708 static void hsw_compute_wm_results(struct drm_device *dev,
2709                                    const struct intel_pipe_wm *merged,
2710                                    struct hsw_wm_values *results)
2711 {
2712         struct intel_crtc *intel_crtc;
2713         int level, wm_lp;
2714
2715         results->enable_fbc_wm = merged->fbc_wm_enabled;
2716
2717         /* LP1+ register values */
2718         for (wm_lp = 1; wm_lp <= 3; wm_lp++) {
2719                 const struct intel_wm_level *r;
2720
2721                 level = wm_lp + (wm_lp >= 2 && merged->wm[4].enable);
2722
2723                 r = &merged->wm[level];
2724                 if (!r->enable)
2725                         break;
2726
2727                 results->wm_lp[wm_lp - 1] = HSW_WM_LP_VAL(level * 2,
2728                                                           r->fbc_val,
2729                                                           r->pri_val,
2730                                                           r->cur_val);
2731                 results->wm_lp_spr[wm_lp - 1] = r->spr_val;
2732         }
2733
2734         /* LP0 register values */
2735         list_for_each_entry(intel_crtc, &dev->mode_config.crtc_list, base.head) {
2736                 enum pipe pipe = intel_crtc->pipe;
2737                 const struct intel_wm_level *r =
2738                         &intel_crtc->wm.active.wm[0];
2739
2740                 if (WARN_ON(!r->enable))
2741                         continue;
2742
2743                 results->wm_linetime[pipe] = intel_crtc->wm.active.linetime;
2744
2745                 results->wm_pipe[pipe] =
2746                         (r->pri_val << WM0_PIPE_PLANE_SHIFT) |
2747                         (r->spr_val << WM0_PIPE_SPRITE_SHIFT) |
2748                         r->cur_val;
2749         }
2750 }
2751
2752 /* Find the result with the highest level enabled. Check for enable_fbc_wm in
2753  * case both are at the same level. Prefer r1 in case they're the same. */
2754 static struct intel_pipe_wm *hsw_find_best_result(struct drm_device *dev,
2755                                                   struct intel_pipe_wm *r1,
2756                                                   struct intel_pipe_wm *r2)
2757 {
2758         int level, max_level = ilk_wm_max_level(dev);
2759         int level1 = 0, level2 = 0;
2760
2761         for (level = 1; level <= max_level; level++) {
2762                 if (r1->wm[level].enable)
2763                         level1 = level;
2764                 if (r2->wm[level].enable)
2765                         level2 = level;
2766         }
2767
2768         if (level1 == level2) {
2769                 if (r2->fbc_wm_enabled && !r1->fbc_wm_enabled)
2770                         return r2;
2771                 else
2772                         return r1;
2773         } else if (level1 > level2) {
2774                 return r1;
2775         } else {
2776                 return r2;
2777         }
2778 }
2779
2780 /*
2781  * The spec says we shouldn't write when we don't need, because every write
2782  * causes WMs to be re-evaluated, expending some power.
2783  */
2784 static void hsw_write_wm_values(struct drm_i915_private *dev_priv,
2785                                 struct hsw_wm_values *results,
2786                                 enum intel_ddb_partitioning partitioning)
2787 {
2788         struct hsw_wm_values previous;
2789         uint32_t val;
2790         enum intel_ddb_partitioning prev_partitioning;
2791         bool prev_enable_fbc_wm;
2792
2793         previous.wm_pipe[0] = I915_READ(WM0_PIPEA_ILK);
2794         previous.wm_pipe[1] = I915_READ(WM0_PIPEB_ILK);
2795         previous.wm_pipe[2] = I915_READ(WM0_PIPEC_IVB);
2796         previous.wm_lp[0] = I915_READ(WM1_LP_ILK);
2797         previous.wm_lp[1] = I915_READ(WM2_LP_ILK);
2798         previous.wm_lp[2] = I915_READ(WM3_LP_ILK);
2799         previous.wm_lp_spr[0] = I915_READ(WM1S_LP_ILK);
2800         previous.wm_lp_spr[1] = I915_READ(WM2S_LP_IVB);
2801         previous.wm_lp_spr[2] = I915_READ(WM3S_LP_IVB);
2802         previous.wm_linetime[0] = I915_READ(PIPE_WM_LINETIME(PIPE_A));
2803         previous.wm_linetime[1] = I915_READ(PIPE_WM_LINETIME(PIPE_B));
2804         previous.wm_linetime[2] = I915_READ(PIPE_WM_LINETIME(PIPE_C));
2805
2806         prev_partitioning = (I915_READ(WM_MISC) & WM_MISC_DATA_PARTITION_5_6) ?
2807                                 INTEL_DDB_PART_5_6 : INTEL_DDB_PART_1_2;
2808
2809         prev_enable_fbc_wm = !(I915_READ(DISP_ARB_CTL) & DISP_FBC_WM_DIS);
2810
2811         if (memcmp(results->wm_pipe, previous.wm_pipe,
2812                    sizeof(results->wm_pipe)) == 0 &&
2813             memcmp(results->wm_lp, previous.wm_lp,
2814                    sizeof(results->wm_lp)) == 0 &&
2815             memcmp(results->wm_lp_spr, previous.wm_lp_spr,
2816                    sizeof(results->wm_lp_spr)) == 0 &&
2817             memcmp(results->wm_linetime, previous.wm_linetime,
2818                    sizeof(results->wm_linetime)) == 0 &&
2819             partitioning == prev_partitioning &&
2820             results->enable_fbc_wm == prev_enable_fbc_wm)
2821                 return;
2822
2823         if (previous.wm_lp[2] != 0)
2824                 I915_WRITE(WM3_LP_ILK, 0);
2825         if (previous.wm_lp[1] != 0)
2826                 I915_WRITE(WM2_LP_ILK, 0);
2827         if (previous.wm_lp[0] != 0)
2828                 I915_WRITE(WM1_LP_ILK, 0);
2829
2830         if (previous.wm_pipe[0] != results->wm_pipe[0])
2831                 I915_WRITE(WM0_PIPEA_ILK, results->wm_pipe[0]);
2832         if (previous.wm_pipe[1] != results->wm_pipe[1])
2833                 I915_WRITE(WM0_PIPEB_ILK, results->wm_pipe[1]);
2834         if (previous.wm_pipe[2] != results->wm_pipe[2])
2835                 I915_WRITE(WM0_PIPEC_IVB, results->wm_pipe[2]);
2836
2837         if (previous.wm_linetime[0] != results->wm_linetime[0])
2838                 I915_WRITE(PIPE_WM_LINETIME(PIPE_A), results->wm_linetime[0]);
2839         if (previous.wm_linetime[1] != results->wm_linetime[1])
2840                 I915_WRITE(PIPE_WM_LINETIME(PIPE_B), results->wm_linetime[1]);
2841         if (previous.wm_linetime[2] != results->wm_linetime[2])
2842                 I915_WRITE(PIPE_WM_LINETIME(PIPE_C), results->wm_linetime[2]);
2843
2844         if (prev_partitioning != partitioning) {
2845                 val = I915_READ(WM_MISC);
2846                 if (partitioning == INTEL_DDB_PART_1_2)
2847                         val &= ~WM_MISC_DATA_PARTITION_5_6;
2848                 else
2849                         val |= WM_MISC_DATA_PARTITION_5_6;
2850                 I915_WRITE(WM_MISC, val);
2851         }
2852
2853         if (prev_enable_fbc_wm != results->enable_fbc_wm) {
2854                 val = I915_READ(DISP_ARB_CTL);
2855                 if (results->enable_fbc_wm)
2856                         val &= ~DISP_FBC_WM_DIS;
2857                 else
2858                         val |= DISP_FBC_WM_DIS;
2859                 I915_WRITE(DISP_ARB_CTL, val);
2860         }
2861
2862         if (previous.wm_lp_spr[0] != results->wm_lp_spr[0])
2863                 I915_WRITE(WM1S_LP_ILK, results->wm_lp_spr[0]);
2864         if (previous.wm_lp_spr[1] != results->wm_lp_spr[1])
2865                 I915_WRITE(WM2S_LP_IVB, results->wm_lp_spr[1]);
2866         if (previous.wm_lp_spr[2] != results->wm_lp_spr[2])
2867                 I915_WRITE(WM3S_LP_IVB, results->wm_lp_spr[2]);
2868
2869         if (results->wm_lp[0] != 0)
2870                 I915_WRITE(WM1_LP_ILK, results->wm_lp[0]);
2871         if (results->wm_lp[1] != 0)
2872                 I915_WRITE(WM2_LP_ILK, results->wm_lp[1]);
2873         if (results->wm_lp[2] != 0)
2874                 I915_WRITE(WM3_LP_ILK, results->wm_lp[2]);
2875 }
2876
2877 static void haswell_update_wm(struct drm_crtc *crtc)
2878 {
2879         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
2880         struct drm_device *dev = crtc->dev;
2881         struct drm_i915_private *dev_priv = dev->dev_private;
2882         struct hsw_wm_maximums max;
2883         struct hsw_pipe_wm_parameters params = {};
2884         struct hsw_wm_values results = {};
2885         enum intel_ddb_partitioning partitioning;
2886         struct intel_pipe_wm pipe_wm = {};
2887         struct intel_pipe_wm lp_wm_1_2 = {}, lp_wm_5_6 = {}, *best_lp_wm;
2888         struct intel_wm_config config = {};
2889
2890         hsw_compute_wm_parameters(crtc, &params, &config);
2891
2892         intel_compute_pipe_wm(crtc, &params, &pipe_wm);
2893
2894         if (!memcmp(&intel_crtc->wm.active, &pipe_wm, sizeof(pipe_wm)))
2895                 return;
2896
2897         intel_crtc->wm.active = pipe_wm;
2898
2899         ilk_wm_max(dev, 1, &config, INTEL_DDB_PART_1_2, &max);
2900         ilk_wm_merge(dev, &max, &lp_wm_1_2);
2901
2902         /* 5/6 split only in single pipe config on IVB+ */
2903         if (INTEL_INFO(dev)->gen >= 7 && config.num_pipes_active <= 1) {
2904                 ilk_wm_max(dev, 1, &config, INTEL_DDB_PART_5_6, &max);
2905                 ilk_wm_merge(dev, &max, &lp_wm_5_6);
2906
2907                 best_lp_wm = hsw_find_best_result(dev, &lp_wm_1_2, &lp_wm_5_6);
2908         } else {
2909                 best_lp_wm = &lp_wm_1_2;
2910         }
2911
2912         hsw_compute_wm_results(dev, best_lp_wm, &results);
2913
2914         partitioning = (best_lp_wm == &lp_wm_1_2) ?
2915                        INTEL_DDB_PART_1_2 : INTEL_DDB_PART_5_6;
2916
2917         hsw_write_wm_values(dev_priv, &results, partitioning);
2918 }
2919
2920 static void haswell_update_sprite_wm(struct drm_plane *plane,
2921                                      struct drm_crtc *crtc,
2922                                      uint32_t sprite_width, int pixel_size,
2923                                      bool enabled, bool scaled)
2924 {
2925         struct intel_plane *intel_plane = to_intel_plane(plane);
2926
2927         intel_plane->wm.enabled = enabled;
2928         intel_plane->wm.scaled = scaled;
2929         intel_plane->wm.horiz_pixels = sprite_width;
2930         intel_plane->wm.bytes_per_pixel = pixel_size;
2931
2932         haswell_update_wm(crtc);
2933 }
2934
2935 static bool
2936 sandybridge_compute_sprite_wm(struct drm_device *dev, int plane,
2937                               uint32_t sprite_width, int pixel_size,
2938                               const struct intel_watermark_params *display,
2939                               int display_latency_ns, int *sprite_wm)
2940 {
2941         struct drm_crtc *crtc;
2942         int clock;
2943         int entries, tlb_miss;
2944
2945         crtc = intel_get_crtc_for_plane(dev, plane);
2946         if (!intel_crtc_active(crtc)) {
2947                 *sprite_wm = display->guard_size;
2948                 return false;
2949         }
2950
2951         clock = to_intel_crtc(crtc)->config.adjusted_mode.crtc_clock;
2952
2953         /* Use the small buffer method to calculate the sprite watermark */
2954         entries = ((clock * pixel_size / 1000) * display_latency_ns) / 1000;
2955         tlb_miss = display->fifo_size*display->cacheline_size -
2956                 sprite_width * 8;
2957         if (tlb_miss > 0)
2958                 entries += tlb_miss;
2959         entries = DIV_ROUND_UP(entries, display->cacheline_size);
2960         *sprite_wm = entries + display->guard_size;
2961         if (*sprite_wm > (int)display->max_wm)
2962                 *sprite_wm = display->max_wm;
2963
2964         return true;
2965 }
2966
2967 static bool
2968 sandybridge_compute_sprite_srwm(struct drm_device *dev, int plane,
2969                                 uint32_t sprite_width, int pixel_size,
2970                                 const struct intel_watermark_params *display,
2971                                 int latency_ns, int *sprite_wm)
2972 {
2973         struct drm_crtc *crtc;
2974         unsigned long line_time_us;
2975         int clock;
2976         int line_count, line_size;
2977         int small, large;
2978         int entries;
2979
2980         if (!latency_ns) {
2981                 *sprite_wm = 0;
2982                 return false;
2983         }
2984
2985         crtc = intel_get_crtc_for_plane(dev, plane);
2986         clock = to_intel_crtc(crtc)->config.adjusted_mode.crtc_clock;
2987         if (!clock) {
2988                 *sprite_wm = 0;
2989                 return false;
2990         }
2991
2992         line_time_us = (sprite_width * 1000) / clock;
2993         if (!line_time_us) {
2994                 *sprite_wm = 0;
2995                 return false;
2996         }
2997
2998         line_count = (latency_ns / line_time_us + 1000) / 1000;
2999         line_size = sprite_width * pixel_size;
3000
3001         /* Use the minimum of the small and large buffer method for primary */
3002         small = ((clock * pixel_size / 1000) * latency_ns) / 1000;
3003         large = line_count * line_size;
3004
3005         entries = DIV_ROUND_UP(min(small, large), display->cacheline_size);
3006         *sprite_wm = entries + display->guard_size;
3007
3008         return *sprite_wm > 0x3ff ? false : true;
3009 }
3010
3011 static void sandybridge_update_sprite_wm(struct drm_plane *plane,
3012                                          struct drm_crtc *crtc,
3013                                          uint32_t sprite_width, int pixel_size,
3014                                          bool enabled, bool scaled)
3015 {
3016         struct drm_device *dev = plane->dev;
3017         struct drm_i915_private *dev_priv = dev->dev_private;
3018         int pipe = to_intel_plane(plane)->pipe;
3019         int latency = dev_priv->wm.spr_latency[0] * 100;        /* In unit 0.1us */
3020         u32 val;
3021         int sprite_wm, reg;
3022         int ret;
3023
3024         if (!enabled)
3025                 return;
3026
3027         switch (pipe) {
3028         case 0:
3029                 reg = WM0_PIPEA_ILK;
3030                 break;
3031         case 1:
3032                 reg = WM0_PIPEB_ILK;
3033                 break;
3034         case 2:
3035                 reg = WM0_PIPEC_IVB;
3036                 break;
3037         default:
3038                 return; /* bad pipe */
3039         }
3040
3041         ret = sandybridge_compute_sprite_wm(dev, pipe, sprite_width, pixel_size,
3042                                             &sandybridge_display_wm_info,
3043                                             latency, &sprite_wm);
3044         if (!ret) {
3045                 DRM_DEBUG_KMS("failed to compute sprite wm for pipe %c\n",
3046                               pipe_name(pipe));
3047                 return;
3048         }
3049
3050         val = I915_READ(reg);
3051         val &= ~WM0_PIPE_SPRITE_MASK;
3052         I915_WRITE(reg, val | (sprite_wm << WM0_PIPE_SPRITE_SHIFT));
3053         DRM_DEBUG_KMS("sprite watermarks For pipe %c - %d\n", pipe_name(pipe), sprite_wm);
3054
3055
3056         ret = sandybridge_compute_sprite_srwm(dev, pipe, sprite_width,
3057                                               pixel_size,
3058                                               &sandybridge_display_srwm_info,
3059                                               dev_priv->wm.spr_latency[1] * 500,
3060                                               &sprite_wm);
3061         if (!ret) {
3062                 DRM_DEBUG_KMS("failed to compute sprite lp1 wm on pipe %c\n",
3063                               pipe_name(pipe));
3064                 return;
3065         }
3066         I915_WRITE(WM1S_LP_ILK, sprite_wm);
3067
3068         /* Only IVB has two more LP watermarks for sprite */
3069         if (!IS_IVYBRIDGE(dev))
3070                 return;
3071
3072         ret = sandybridge_compute_sprite_srwm(dev, pipe, sprite_width,
3073                                               pixel_size,
3074                                               &sandybridge_display_srwm_info,
3075                                               dev_priv->wm.spr_latency[2] * 500,
3076                                               &sprite_wm);
3077         if (!ret) {
3078                 DRM_DEBUG_KMS("failed to compute sprite lp2 wm on pipe %c\n",
3079                               pipe_name(pipe));
3080                 return;
3081         }
3082         I915_WRITE(WM2S_LP_IVB, sprite_wm);
3083
3084         ret = sandybridge_compute_sprite_srwm(dev, pipe, sprite_width,
3085                                               pixel_size,
3086                                               &sandybridge_display_srwm_info,
3087                                               dev_priv->wm.spr_latency[3] * 500,
3088                                               &sprite_wm);
3089         if (!ret) {
3090                 DRM_DEBUG_KMS("failed to compute sprite lp3 wm on pipe %c\n",
3091                               pipe_name(pipe));
3092                 return;
3093         }
3094         I915_WRITE(WM3S_LP_IVB, sprite_wm);
3095 }
3096
3097 /**
3098  * intel_update_watermarks - update FIFO watermark values based on current modes
3099  *
3100  * Calculate watermark values for the various WM regs based on current mode
3101  * and plane configuration.
3102  *
3103  * There are several cases to deal with here:
3104  *   - normal (i.e. non-self-refresh)
3105  *   - self-refresh (SR) mode
3106  *   - lines are large relative to FIFO size (buffer can hold up to 2)
3107  *   - lines are small relative to FIFO size (buffer can hold more than 2
3108  *     lines), so need to account for TLB latency
3109  *
3110  *   The normal calculation is:
3111  *     watermark = dotclock * bytes per pixel * latency
3112  *   where latency is platform & configuration dependent (we assume pessimal
3113  *   values here).
3114  *
3115  *   The SR calculation is:
3116  *     watermark = (trunc(latency/line time)+1) * surface width *
3117  *       bytes per pixel
3118  *   where
3119  *     line time = htotal / dotclock
3120  *     surface width = hdisplay for normal plane and 64 for cursor
3121  *   and latency is assumed to be high, as above.
3122  *
3123  * The final value programmed to the register should always be rounded up,
3124  * and include an extra 2 entries to account for clock crossings.
3125  *
3126  * We don't use the sprite, so we can ignore that.  And on Crestline we have
3127  * to set the non-SR watermarks to 8.
3128  */
3129 void intel_update_watermarks(struct drm_crtc *crtc)
3130 {
3131         struct drm_i915_private *dev_priv = crtc->dev->dev_private;
3132
3133         if (dev_priv->display.update_wm)
3134                 dev_priv->display.update_wm(crtc);
3135 }
3136
3137 void intel_update_sprite_watermarks(struct drm_plane *plane,
3138                                     struct drm_crtc *crtc,
3139                                     uint32_t sprite_width, int pixel_size,
3140                                     bool enabled, bool scaled)
3141 {
3142         struct drm_i915_private *dev_priv = plane->dev->dev_private;
3143
3144         if (dev_priv->display.update_sprite_wm)
3145                 dev_priv->display.update_sprite_wm(plane, crtc, sprite_width,
3146                                                    pixel_size, enabled, scaled);
3147 }
3148
3149 static struct drm_i915_gem_object *
3150 intel_alloc_context_page(struct drm_device *dev)
3151 {
3152         struct drm_i915_gem_object *ctx;
3153         int ret;
3154
3155         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
3156
3157         ctx = i915_gem_alloc_object(dev, 4096);
3158         if (!ctx) {
3159                 DRM_DEBUG("failed to alloc power context, RC6 disabled\n");
3160                 return NULL;
3161         }
3162
3163         ret = i915_gem_obj_ggtt_pin(ctx, 4096, true, false);
3164         if (ret) {
3165                 DRM_ERROR("failed to pin power context: %d\n", ret);
3166                 goto err_unref;
3167         }
3168
3169         ret = i915_gem_object_set_to_gtt_domain(ctx, 1);
3170         if (ret) {
3171                 DRM_ERROR("failed to set-domain on power context: %d\n", ret);
3172                 goto err_unpin;
3173         }
3174
3175         return ctx;
3176
3177 err_unpin:
3178         i915_gem_object_unpin(ctx);
3179 err_unref:
3180         drm_gem_object_unreference(&ctx->base);
3181         return NULL;
3182 }
3183
3184 /**
3185  * Lock protecting IPS related data structures
3186  */
3187 DEFINE_SPINLOCK(mchdev_lock);
3188
3189 /* Global for IPS driver to get at the current i915 device. Protected by
3190  * mchdev_lock. */
3191 static struct drm_i915_private *i915_mch_dev;
3192
3193 bool ironlake_set_drps(struct drm_device *dev, u8 val)
3194 {
3195         struct drm_i915_private *dev_priv = dev->dev_private;
3196         u16 rgvswctl;
3197
3198         assert_spin_locked(&mchdev_lock);
3199
3200         rgvswctl = I915_READ16(MEMSWCTL);
3201         if (rgvswctl & MEMCTL_CMD_STS) {
3202                 DRM_DEBUG("gpu busy, RCS change rejected\n");
3203                 return false; /* still busy with another command */
3204         }
3205
3206         rgvswctl = (MEMCTL_CMD_CHFREQ << MEMCTL_CMD_SHIFT) |
3207                 (val << MEMCTL_FREQ_SHIFT) | MEMCTL_SFCAVM;
3208         I915_WRITE16(MEMSWCTL, rgvswctl);
3209         POSTING_READ16(MEMSWCTL);
3210
3211         rgvswctl |= MEMCTL_CMD_STS;
3212         I915_WRITE16(MEMSWCTL, rgvswctl);
3213
3214         return true;
3215 }
3216
3217 static void ironlake_enable_drps(struct drm_device *dev)
3218 {
3219         struct drm_i915_private *dev_priv = dev->dev_private;
3220         u32 rgvmodectl = I915_READ(MEMMODECTL);
3221         u8 fmax, fmin, fstart, vstart;
3222
3223         spin_lock_irq(&mchdev_lock);
3224
3225         /* Enable temp reporting */
3226         I915_WRITE16(PMMISC, I915_READ(PMMISC) | MCPPCE_EN);
3227         I915_WRITE16(TSC1, I915_READ(TSC1) | TSE);
3228
3229         /* 100ms RC evaluation intervals */
3230         I915_WRITE(RCUPEI, 100000);
3231         I915_WRITE(RCDNEI, 100000);
3232
3233         /* Set max/min thresholds to 90ms and 80ms respectively */
3234         I915_WRITE(RCBMAXAVG, 90000);
3235         I915_WRITE(RCBMINAVG, 80000);
3236
3237         I915_WRITE(MEMIHYST, 1);
3238
3239         /* Set up min, max, and cur for interrupt handling */
3240         fmax = (rgvmodectl & MEMMODE_FMAX_MASK) >> MEMMODE_FMAX_SHIFT;
3241         fmin = (rgvmodectl & MEMMODE_FMIN_MASK);
3242         fstart = (rgvmodectl & MEMMODE_FSTART_MASK) >>
3243                 MEMMODE_FSTART_SHIFT;
3244
3245         vstart = (I915_READ(PXVFREQ_BASE + (fstart * 4)) & PXVFREQ_PX_MASK) >>
3246                 PXVFREQ_PX_SHIFT;
3247
3248         dev_priv->ips.fmax = fmax; /* IPS callback will increase this */
3249         dev_priv->ips.fstart = fstart;
3250
3251         dev_priv->ips.max_delay = fstart;
3252         dev_priv->ips.min_delay = fmin;
3253         dev_priv->ips.cur_delay = fstart;
3254
3255         DRM_DEBUG_DRIVER("fmax: %d, fmin: %d, fstart: %d\n",
3256                          fmax, fmin, fstart);
3257
3258         I915_WRITE(MEMINTREN, MEMINT_CX_SUPR_EN | MEMINT_EVAL_CHG_EN);
3259
3260         /*
3261          * Interrupts will be enabled in ironlake_irq_postinstall
3262          */
3263
3264         I915_WRITE(VIDSTART, vstart);
3265         POSTING_READ(VIDSTART);
3266
3267         rgvmodectl |= MEMMODE_SWMODE_EN;
3268         I915_WRITE(MEMMODECTL, rgvmodectl);
3269
3270         if (wait_for_atomic((I915_READ(MEMSWCTL) & MEMCTL_CMD_STS) == 0, 10))
3271                 DRM_ERROR("stuck trying to change perf mode\n");
3272         mdelay(1);
3273
3274         ironlake_set_drps(dev, fstart);
3275
3276         dev_priv->ips.last_count1 = I915_READ(0x112e4) + I915_READ(0x112e8) +
3277                 I915_READ(0x112e0);
3278         dev_priv->ips.last_time1 = jiffies_to_msecs(jiffies);
3279         dev_priv->ips.last_count2 = I915_READ(0x112f4);
3280         getrawmonotonic(&dev_priv->ips.last_time2);
3281
3282         spin_unlock_irq(&mchdev_lock);
3283 }
3284
3285 static void ironlake_disable_drps(struct drm_device *dev)
3286 {
3287         struct drm_i915_private *dev_priv = dev->dev_private;
3288         u16 rgvswctl;
3289
3290         spin_lock_irq(&mchdev_lock);
3291
3292         rgvswctl = I915_READ16(MEMSWCTL);
3293
3294         /* Ack interrupts, disable EFC interrupt */
3295         I915_WRITE(MEMINTREN, I915_READ(MEMINTREN) & ~MEMINT_EVAL_CHG_EN);
3296         I915_WRITE(MEMINTRSTS, MEMINT_EVAL_CHG);
3297         I915_WRITE(DEIER, I915_READ(DEIER) & ~DE_PCU_EVENT);
3298         I915_WRITE(DEIIR, DE_PCU_EVENT);
3299         I915_WRITE(DEIMR, I915_READ(DEIMR) | DE_PCU_EVENT);
3300
3301         /* Go back to the starting frequency */
3302         ironlake_set_drps(dev, dev_priv->ips.fstart);
3303         mdelay(1);
3304         rgvswctl |= MEMCTL_CMD_STS;
3305         I915_WRITE(MEMSWCTL, rgvswctl);
3306         mdelay(1);
3307
3308         spin_unlock_irq(&mchdev_lock);
3309 }
3310
3311 /* There's a funny hw issue where the hw returns all 0 when reading from
3312  * GEN6_RP_INTERRUPT_LIMITS. Hence we always need to compute the desired value
3313  * ourselves, instead of doing a rmw cycle (which might result in us clearing
3314  * all limits and the gpu stuck at whatever frequency it is at atm).
3315  */
3316 static u32 gen6_rps_limits(struct drm_i915_private *dev_priv, u8 *val)
3317 {
3318         u32 limits;
3319
3320         limits = 0;
3321
3322         if (*val >= dev_priv->rps.max_delay)
3323                 *val = dev_priv->rps.max_delay;
3324         limits |= dev_priv->rps.max_delay << 24;
3325
3326         /* Only set the down limit when we've reached the lowest level to avoid
3327          * getting more interrupts, otherwise leave this clear. This prevents a
3328          * race in the hw when coming out of rc6: There's a tiny window where
3329          * the hw runs at the minimal clock before selecting the desired
3330          * frequency, if the down threshold expires in that window we will not
3331          * receive a down interrupt. */
3332         if (*val <= dev_priv->rps.min_delay) {
3333                 *val = dev_priv->rps.min_delay;
3334                 limits |= dev_priv->rps.min_delay << 16;
3335         }
3336
3337         return limits;
3338 }
3339
3340 static void gen6_set_rps_thresholds(struct drm_i915_private *dev_priv, u8 val)
3341 {
3342         int new_power;
3343
3344         new_power = dev_priv->rps.power;
3345         switch (dev_priv->rps.power) {
3346         case LOW_POWER:
3347                 if (val > dev_priv->rps.rpe_delay + 1 && val > dev_priv->rps.cur_delay)
3348                         new_power = BETWEEN;
3349                 break;
3350
3351         case BETWEEN:
3352                 if (val <= dev_priv->rps.rpe_delay && val < dev_priv->rps.cur_delay)
3353                         new_power = LOW_POWER;
3354                 else if (val >= dev_priv->rps.rp0_delay && val > dev_priv->rps.cur_delay)
3355                         new_power = HIGH_POWER;
3356                 break;
3357
3358         case HIGH_POWER:
3359                 if (val < (dev_priv->rps.rp1_delay + dev_priv->rps.rp0_delay) >> 1 && val < dev_priv->rps.cur_delay)
3360                         new_power = BETWEEN;
3361                 break;
3362         }
3363         /* Max/min bins are special */
3364         if (val == dev_priv->rps.min_delay)
3365                 new_power = LOW_POWER;
3366         if (val == dev_priv->rps.max_delay)
3367                 new_power = HIGH_POWER;
3368         if (new_power == dev_priv->rps.power)
3369                 return;
3370
3371         /* Note the units here are not exactly 1us, but 1280ns. */
3372         switch (new_power) {
3373         case LOW_POWER:
3374                 /* Upclock if more than 95% busy over 16ms */
3375                 I915_WRITE(GEN6_RP_UP_EI, 12500);
3376                 I915_WRITE(GEN6_RP_UP_THRESHOLD, 11800);
3377
3378                 /* Downclock if less than 85% busy over 32ms */
3379                 I915_WRITE(GEN6_RP_DOWN_EI, 25000);
3380                 I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 21250);
3381
3382                 I915_WRITE(GEN6_RP_CONTROL,
3383                            GEN6_RP_MEDIA_TURBO |
3384                            GEN6_RP_MEDIA_HW_NORMAL_MODE |
3385                            GEN6_RP_MEDIA_IS_GFX |
3386                            GEN6_RP_ENABLE |
3387                            GEN6_RP_UP_BUSY_AVG |
3388                            GEN6_RP_DOWN_IDLE_AVG);
3389                 break;
3390
3391         case BETWEEN:
3392                 /* Upclock if more than 90% busy over 13ms */
3393                 I915_WRITE(GEN6_RP_UP_EI, 10250);
3394                 I915_WRITE(GEN6_RP_UP_THRESHOLD, 9225);
3395
3396                 /* Downclock if less than 75% busy over 32ms */
3397                 I915_WRITE(GEN6_RP_DOWN_EI, 25000);
3398                 I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 18750);
3399
3400                 I915_WRITE(GEN6_RP_CONTROL,
3401                            GEN6_RP_MEDIA_TURBO |
3402                            GEN6_RP_MEDIA_HW_NORMAL_MODE |
3403                            GEN6_RP_MEDIA_IS_GFX |
3404                            GEN6_RP_ENABLE |
3405                            GEN6_RP_UP_BUSY_AVG |
3406                            GEN6_RP_DOWN_IDLE_AVG);
3407                 break;
3408
3409         case HIGH_POWER:
3410                 /* Upclock if more than 85% busy over 10ms */
3411                 I915_WRITE(GEN6_RP_UP_EI, 8000);
3412                 I915_WRITE(GEN6_RP_UP_THRESHOLD, 6800);
3413
3414                 /* Downclock if less than 60% busy over 32ms */
3415                 I915_WRITE(GEN6_RP_DOWN_EI, 25000);
3416                 I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 15000);
3417
3418                 I915_WRITE(GEN6_RP_CONTROL,
3419                            GEN6_RP_MEDIA_TURBO |
3420                            GEN6_RP_MEDIA_HW_NORMAL_MODE |
3421                            GEN6_RP_MEDIA_IS_GFX |
3422                            GEN6_RP_ENABLE |
3423                            GEN6_RP_UP_BUSY_AVG |
3424                            GEN6_RP_DOWN_IDLE_AVG);
3425                 break;
3426         }
3427
3428         dev_priv->rps.power = new_power;
3429         dev_priv->rps.last_adj = 0;
3430 }
3431
3432 void gen6_set_rps(struct drm_device *dev, u8 val)
3433 {
3434         struct drm_i915_private *dev_priv = dev->dev_private;
3435         u32 limits = gen6_rps_limits(dev_priv, &val);
3436
3437         WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
3438         WARN_ON(val > dev_priv->rps.max_delay);
3439         WARN_ON(val < dev_priv->rps.min_delay);
3440
3441         if (val == dev_priv->rps.cur_delay)
3442                 return;
3443
3444         gen6_set_rps_thresholds(dev_priv, val);
3445
3446         if (IS_HASWELL(dev))
3447                 I915_WRITE(GEN6_RPNSWREQ,
3448                            HSW_FREQUENCY(val));
3449         else
3450                 I915_WRITE(GEN6_RPNSWREQ,
3451                            GEN6_FREQUENCY(val) |
3452                            GEN6_OFFSET(0) |
3453                            GEN6_AGGRESSIVE_TURBO);
3454
3455         /* Make sure we continue to get interrupts
3456          * until we hit the minimum or maximum frequencies.
3457          */
3458         I915_WRITE(GEN6_RP_INTERRUPT_LIMITS, limits);
3459
3460         POSTING_READ(GEN6_RPNSWREQ);
3461
3462         dev_priv->rps.cur_delay = val;
3463
3464         trace_intel_gpu_freq_change(val * 50);
3465 }
3466
3467 void gen6_rps_idle(struct drm_i915_private *dev_priv)
3468 {
3469         mutex_lock(&dev_priv->rps.hw_lock);
3470         if (dev_priv->rps.enabled) {
3471                 if (dev_priv->info->is_valleyview)
3472                         valleyview_set_rps(dev_priv->dev, dev_priv->rps.min_delay);
3473                 else
3474                         gen6_set_rps(dev_priv->dev, dev_priv->rps.min_delay);
3475                 dev_priv->rps.last_adj = 0;
3476         }
3477         mutex_unlock(&dev_priv->rps.hw_lock);
3478 }
3479
3480 void gen6_rps_boost(struct drm_i915_private *dev_priv)
3481 {
3482         mutex_lock(&dev_priv->rps.hw_lock);
3483         if (dev_priv->rps.enabled) {
3484                 if (dev_priv->info->is_valleyview)
3485                         valleyview_set_rps(dev_priv->dev, dev_priv->rps.max_delay);
3486                 else
3487                         gen6_set_rps(dev_priv->dev, dev_priv->rps.max_delay);
3488                 dev_priv->rps.last_adj = 0;
3489         }
3490         mutex_unlock(&dev_priv->rps.hw_lock);
3491 }
3492
3493 /*
3494  * Wait until the previous freq change has completed,
3495  * or the timeout elapsed, and then update our notion
3496  * of the current GPU frequency.
3497  */
3498 static void vlv_update_rps_cur_delay(struct drm_i915_private *dev_priv)
3499 {
3500         u32 pval;
3501
3502         WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
3503
3504         if (wait_for(((pval = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS)) & GENFREQSTATUS) == 0, 10))
3505                 DRM_DEBUG_DRIVER("timed out waiting for Punit\n");
3506
3507         pval >>= 8;
3508
3509         if (pval != dev_priv->rps.cur_delay)
3510                 DRM_DEBUG_DRIVER("Punit overrode GPU freq: %d MHz (%u) requested, but got %d Mhz (%u)\n",
3511                                  vlv_gpu_freq(dev_priv->mem_freq, dev_priv->rps.cur_delay),
3512                                  dev_priv->rps.cur_delay,
3513                                  vlv_gpu_freq(dev_priv->mem_freq, pval), pval);
3514
3515         dev_priv->rps.cur_delay = pval;
3516 }
3517
3518 void valleyview_set_rps(struct drm_device *dev, u8 val)
3519 {
3520         struct drm_i915_private *dev_priv = dev->dev_private;
3521
3522         gen6_rps_limits(dev_priv, &val);
3523
3524         WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
3525         WARN_ON(val > dev_priv->rps.max_delay);
3526         WARN_ON(val < dev_priv->rps.min_delay);
3527
3528         vlv_update_rps_cur_delay(dev_priv);
3529
3530         DRM_DEBUG_DRIVER("GPU freq request from %d MHz (%u) to %d MHz (%u)\n",
3531                          vlv_gpu_freq(dev_priv->mem_freq,
3532                                       dev_priv->rps.cur_delay),
3533                          dev_priv->rps.cur_delay,
3534                          vlv_gpu_freq(dev_priv->mem_freq, val), val);
3535
3536         if (val == dev_priv->rps.cur_delay)
3537                 return;
3538
3539         vlv_punit_write(dev_priv, PUNIT_REG_GPU_FREQ_REQ, val);
3540
3541         dev_priv->rps.cur_delay = val;
3542
3543         trace_intel_gpu_freq_change(vlv_gpu_freq(dev_priv->mem_freq, val));
3544 }
3545
3546 static void gen6_disable_rps_interrupts(struct drm_device *dev)
3547 {
3548         struct drm_i915_private *dev_priv = dev->dev_private;
3549
3550         I915_WRITE(GEN6_PMINTRMSK, 0xffffffff);
3551         I915_WRITE(GEN6_PMIER, I915_READ(GEN6_PMIER) & ~GEN6_PM_RPS_EVENTS);
3552         /* Complete PM interrupt masking here doesn't race with the rps work
3553          * item again unmasking PM interrupts because that is using a different
3554          * register (PMIMR) to mask PM interrupts. The only risk is in leaving
3555          * stale bits in PMIIR and PMIMR which gen6_enable_rps will clean up. */
3556
3557         spin_lock_irq(&dev_priv->irq_lock);
3558         dev_priv->rps.pm_iir = 0;
3559         spin_unlock_irq(&dev_priv->irq_lock);
3560
3561         I915_WRITE(GEN6_PMIIR, GEN6_PM_RPS_EVENTS);
3562 }
3563
3564 static void gen6_disable_rps(struct drm_device *dev)
3565 {
3566         struct drm_i915_private *dev_priv = dev->dev_private;
3567
3568         I915_WRITE(GEN6_RC_CONTROL, 0);
3569         I915_WRITE(GEN6_RPNSWREQ, 1 << 31);
3570
3571         gen6_disable_rps_interrupts(dev);
3572 }
3573
3574 static void valleyview_disable_rps(struct drm_device *dev)
3575 {
3576         struct drm_i915_private *dev_priv = dev->dev_private;
3577
3578         I915_WRITE(GEN6_RC_CONTROL, 0);
3579
3580         gen6_disable_rps_interrupts(dev);
3581
3582         if (dev_priv->vlv_pctx) {
3583                 drm_gem_object_unreference(&dev_priv->vlv_pctx->base);
3584                 dev_priv->vlv_pctx = NULL;
3585         }
3586 }
3587
3588 int intel_enable_rc6(const struct drm_device *dev)
3589 {
3590         /* No RC6 before Ironlake */
3591         if (INTEL_INFO(dev)->gen < 5)
3592                 return 0;
3593
3594         /* Respect the kernel parameter if it is set */
3595         if (i915_enable_rc6 >= 0)
3596                 return i915_enable_rc6;
3597
3598         /* Disable RC6 on Ironlake */
3599         if (INTEL_INFO(dev)->gen == 5)
3600                 return 0;
3601
3602         if (IS_HASWELL(dev)) {
3603                 DRM_DEBUG_DRIVER("Haswell: only RC6 available\n");
3604                 return INTEL_RC6_ENABLE;
3605         }
3606
3607         /* snb/ivb have more than one rc6 state. */
3608         if (INTEL_INFO(dev)->gen == 6) {
3609                 DRM_DEBUG_DRIVER("Sandybridge: deep RC6 disabled\n");
3610                 return INTEL_RC6_ENABLE;
3611         }
3612
3613         DRM_DEBUG_DRIVER("RC6 and deep RC6 enabled\n");
3614         return (INTEL_RC6_ENABLE | INTEL_RC6p_ENABLE);
3615 }
3616
3617 static void gen6_enable_rps_interrupts(struct drm_device *dev)
3618 {
3619         struct drm_i915_private *dev_priv = dev->dev_private;
3620         u32 enabled_intrs;
3621
3622         spin_lock_irq(&dev_priv->irq_lock);
3623         WARN_ON(dev_priv->rps.pm_iir);
3624         snb_enable_pm_irq(dev_priv, GEN6_PM_RPS_EVENTS);
3625         I915_WRITE(GEN6_PMIIR, GEN6_PM_RPS_EVENTS);
3626         spin_unlock_irq(&dev_priv->irq_lock);
3627
3628         /* only unmask PM interrupts we need. Mask all others. */
3629         enabled_intrs = GEN6_PM_RPS_EVENTS;
3630
3631         /* IVB and SNB hard hangs on looping batchbuffer
3632          * if GEN6_PM_UP_EI_EXPIRED is masked.
3633          */
3634         if (INTEL_INFO(dev)->gen <= 7 && !IS_HASWELL(dev))
3635                 enabled_intrs |= GEN6_PM_RP_UP_EI_EXPIRED;
3636
3637         I915_WRITE(GEN6_PMINTRMSK, ~enabled_intrs);
3638 }
3639
3640 static void gen6_enable_rps(struct drm_device *dev)
3641 {
3642         struct drm_i915_private *dev_priv = dev->dev_private;
3643         struct intel_ring_buffer *ring;
3644         u32 rp_state_cap;
3645         u32 gt_perf_status;
3646         u32 rc6vids, pcu_mbox, rc6_mask = 0;
3647         u32 gtfifodbg;
3648         int rc6_mode;
3649         int i, ret;
3650
3651         WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
3652
3653         /* Here begins a magic sequence of register writes to enable
3654          * auto-downclocking.
3655          *
3656          * Perhaps there might be some value in exposing these to
3657          * userspace...
3658          */
3659         I915_WRITE(GEN6_RC_STATE, 0);
3660
3661         /* Clear the DBG now so we don't confuse earlier errors */
3662         if ((gtfifodbg = I915_READ(GTFIFODBG))) {
3663                 DRM_ERROR("GT fifo had a previous error %x\n", gtfifodbg);
3664                 I915_WRITE(GTFIFODBG, gtfifodbg);
3665         }
3666
3667         gen6_gt_force_wake_get(dev_priv);
3668
3669         rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
3670         gt_perf_status = I915_READ(GEN6_GT_PERF_STATUS);
3671
3672         /* In units of 50MHz */
3673         dev_priv->rps.hw_max = dev_priv->rps.max_delay = rp_state_cap & 0xff;
3674         dev_priv->rps.min_delay = (rp_state_cap >> 16) & 0xff;
3675         dev_priv->rps.rp1_delay = (rp_state_cap >>  8) & 0xff;
3676         dev_priv->rps.rp0_delay = (rp_state_cap >>  0) & 0xff;
3677         dev_priv->rps.rpe_delay = dev_priv->rps.rp1_delay;
3678         dev_priv->rps.cur_delay = 0;
3679
3680         /* disable the counters and set deterministic thresholds */
3681         I915_WRITE(GEN6_RC_CONTROL, 0);
3682
3683         I915_WRITE(GEN6_RC1_WAKE_RATE_LIMIT, 1000 << 16);
3684         I915_WRITE(GEN6_RC6_WAKE_RATE_LIMIT, 40 << 16 | 30);
3685         I915_WRITE(GEN6_RC6pp_WAKE_RATE_LIMIT, 30);
3686         I915_WRITE(GEN6_RC_EVALUATION_INTERVAL, 125000);
3687         I915_WRITE(GEN6_RC_IDLE_HYSTERSIS, 25);
3688
3689         for_each_ring(ring, dev_priv, i)
3690                 I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
3691
3692         I915_WRITE(GEN6_RC_SLEEP, 0);
3693         I915_WRITE(GEN6_RC1e_THRESHOLD, 1000);
3694         if (INTEL_INFO(dev)->gen <= 6 || IS_IVYBRIDGE(dev))
3695                 I915_WRITE(GEN6_RC6_THRESHOLD, 125000);
3696         else
3697                 I915_WRITE(GEN6_RC6_THRESHOLD, 50000);
3698         I915_WRITE(GEN6_RC6p_THRESHOLD, 150000);
3699         I915_WRITE(GEN6_RC6pp_THRESHOLD, 64000); /* unused */
3700
3701         /* Check if we are enabling RC6 */
3702         rc6_mode = intel_enable_rc6(dev_priv->dev);
3703         if (rc6_mode & INTEL_RC6_ENABLE)
3704                 rc6_mask |= GEN6_RC_CTL_RC6_ENABLE;
3705
3706         /* We don't use those on Haswell */
3707         if (!IS_HASWELL(dev)) {
3708                 if (rc6_mode & INTEL_RC6p_ENABLE)
3709                         rc6_mask |= GEN6_RC_CTL_RC6p_ENABLE;
3710
3711                 if (rc6_mode & INTEL_RC6pp_ENABLE)
3712                         rc6_mask |= GEN6_RC_CTL_RC6pp_ENABLE;
3713         }
3714
3715         DRM_INFO("Enabling RC6 states: RC6 %s, RC6p %s, RC6pp %s\n",
3716                         (rc6_mask & GEN6_RC_CTL_RC6_ENABLE) ? "on" : "off",
3717                         (rc6_mask & GEN6_RC_CTL_RC6p_ENABLE) ? "on" : "off",
3718                         (rc6_mask & GEN6_RC_CTL_RC6pp_ENABLE) ? "on" : "off");
3719
3720         I915_WRITE(GEN6_RC_CONTROL,
3721                    rc6_mask |
3722                    GEN6_RC_CTL_EI_MODE(1) |
3723                    GEN6_RC_CTL_HW_ENABLE);
3724
3725         /* Power down if completely idle for over 50ms */
3726         I915_WRITE(GEN6_RP_DOWN_TIMEOUT, 50000);
3727         I915_WRITE(GEN6_RP_IDLE_HYSTERSIS, 10);
3728
3729         ret = sandybridge_pcode_write(dev_priv, GEN6_PCODE_WRITE_MIN_FREQ_TABLE, 0);
3730         if (!ret) {
3731                 pcu_mbox = 0;
3732                 ret = sandybridge_pcode_read(dev_priv, GEN6_READ_OC_PARAMS, &pcu_mbox);
3733                 if (!ret && (pcu_mbox & (1<<31))) { /* OC supported */
3734                         DRM_DEBUG_DRIVER("Overclocking supported. Max: %dMHz, Overclock max: %dMHz\n",
3735                                          (dev_priv->rps.max_delay & 0xff) * 50,
3736                                          (pcu_mbox & 0xff) * 50);
3737                         dev_priv->rps.hw_max = pcu_mbox & 0xff;
3738                 }
3739         } else {
3740                 DRM_DEBUG_DRIVER("Failed to set the min frequency\n");
3741         }
3742
3743         dev_priv->rps.power = HIGH_POWER; /* force a reset */
3744         gen6_set_rps(dev_priv->dev, dev_priv->rps.min_delay);
3745
3746         gen6_enable_rps_interrupts(dev);
3747
3748         rc6vids = 0;
3749         ret = sandybridge_pcode_read(dev_priv, GEN6_PCODE_READ_RC6VIDS, &rc6vids);
3750         if (IS_GEN6(dev) && ret) {
3751                 DRM_DEBUG_DRIVER("Couldn't check for BIOS workaround\n");
3752         } else if (IS_GEN6(dev) && (GEN6_DECODE_RC6_VID(rc6vids & 0xff) < 450)) {
3753                 DRM_DEBUG_DRIVER("You should update your BIOS. Correcting minimum rc6 voltage (%dmV->%dmV)\n",
3754                           GEN6_DECODE_RC6_VID(rc6vids & 0xff), 450);
3755                 rc6vids &= 0xffff00;
3756                 rc6vids |= GEN6_ENCODE_RC6_VID(450);
3757                 ret = sandybridge_pcode_write(dev_priv, GEN6_PCODE_WRITE_RC6VIDS, rc6vids);
3758                 if (ret)
3759                         DRM_ERROR("Couldn't fix incorrect rc6 voltage\n");
3760         }
3761
3762         gen6_gt_force_wake_put(dev_priv);
3763 }
3764
3765 void gen6_update_ring_freq(struct drm_device *dev)
3766 {
3767         struct drm_i915_private *dev_priv = dev->dev_private;
3768         int min_freq = 15;
3769         unsigned int gpu_freq;
3770         unsigned int max_ia_freq, min_ring_freq;
3771         int scaling_factor = 180;
3772         struct cpufreq_policy *policy;
3773
3774         WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
3775
3776         policy = cpufreq_cpu_get(0);
3777         if (policy) {
3778                 max_ia_freq = policy->cpuinfo.max_freq;
3779                 cpufreq_cpu_put(policy);
3780         } else {
3781                 /*
3782                  * Default to measured freq if none found, PCU will ensure we
3783                  * don't go over
3784                  */
3785                 max_ia_freq = tsc_khz;
3786         }
3787
3788         /* Convert from kHz to MHz */
3789         max_ia_freq /= 1000;
3790
3791         min_ring_freq = I915_READ(MCHBAR_MIRROR_BASE_SNB + DCLK) & 0xf;
3792         /* convert DDR frequency from units of 266.6MHz to bandwidth */
3793         min_ring_freq = mult_frac(min_ring_freq, 8, 3);
3794
3795         /*
3796          * For each potential GPU frequency, load a ring frequency we'd like
3797          * to use for memory access.  We do this by specifying the IA frequency
3798          * the PCU should use as a reference to determine the ring frequency.
3799          */
3800         for (gpu_freq = dev_priv->rps.max_delay; gpu_freq >= dev_priv->rps.min_delay;
3801              gpu_freq--) {
3802                 int diff = dev_priv->rps.max_delay - gpu_freq;
3803                 unsigned int ia_freq = 0, ring_freq = 0;
3804
3805                 if (IS_HASWELL(dev)) {
3806                         ring_freq = mult_frac(gpu_freq, 5, 4);
3807                         ring_freq = max(min_ring_freq, ring_freq);
3808                         /* leave ia_freq as the default, chosen by cpufreq */
3809                 } else {
3810                         /* On older processors, there is no separate ring
3811                          * clock domain, so in order to boost the bandwidth
3812                          * of the ring, we need to upclock the CPU (ia_freq).
3813                          *
3814                          * For GPU frequencies less than 750MHz,
3815                          * just use the lowest ring freq.
3816                          */
3817                         if (gpu_freq < min_freq)
3818                                 ia_freq = 800;
3819                         else
3820                                 ia_freq = max_ia_freq - ((diff * scaling_factor) / 2);
3821                         ia_freq = DIV_ROUND_CLOSEST(ia_freq, 100);
3822                 }
3823
3824                 sandybridge_pcode_write(dev_priv,
3825                                         GEN6_PCODE_WRITE_MIN_FREQ_TABLE,
3826                                         ia_freq << GEN6_PCODE_FREQ_IA_RATIO_SHIFT |
3827                                         ring_freq << GEN6_PCODE_FREQ_RING_RATIO_SHIFT |
3828                                         gpu_freq);
3829         }
3830 }
3831
3832 int valleyview_rps_max_freq(struct drm_i915_private *dev_priv)
3833 {
3834         u32 val, rp0;
3835
3836         val = vlv_nc_read(dev_priv, IOSF_NC_FB_GFX_FREQ_FUSE);
3837
3838         rp0 = (val & FB_GFX_MAX_FREQ_FUSE_MASK) >> FB_GFX_MAX_FREQ_FUSE_SHIFT;
3839         /* Clamp to max */
3840         rp0 = min_t(u32, rp0, 0xea);
3841
3842         return rp0;
3843 }
3844
3845 static int valleyview_rps_rpe_freq(struct drm_i915_private *dev_priv)
3846 {
3847         u32 val, rpe;
3848
3849         val = vlv_nc_read(dev_priv, IOSF_NC_FB_GFX_FMAX_FUSE_LO);
3850         rpe = (val & FB_FMAX_VMIN_FREQ_LO_MASK) >> FB_FMAX_VMIN_FREQ_LO_SHIFT;
3851         val = vlv_nc_read(dev_priv, IOSF_NC_FB_GFX_FMAX_FUSE_HI);
3852         rpe |= (val & FB_FMAX_VMIN_FREQ_HI_MASK) << 5;
3853
3854         return rpe;
3855 }
3856
3857 int valleyview_rps_min_freq(struct drm_i915_private *dev_priv)
3858 {
3859         return vlv_punit_read(dev_priv, PUNIT_REG_GPU_LFM) & 0xff;
3860 }
3861
3862 static void valleyview_setup_pctx(struct drm_device *dev)
3863 {
3864         struct drm_i915_private *dev_priv = dev->dev_private;
3865         struct drm_i915_gem_object *pctx;
3866         unsigned long pctx_paddr;
3867         u32 pcbr;
3868         int pctx_size = 24*1024;
3869
3870         pcbr = I915_READ(VLV_PCBR);
3871         if (pcbr) {
3872                 /* BIOS set it up already, grab the pre-alloc'd space */
3873                 int pcbr_offset;
3874
3875                 pcbr_offset = (pcbr & (~4095)) - dev_priv->mm.stolen_base;
3876                 pctx = i915_gem_object_create_stolen_for_preallocated(dev_priv->dev,
3877                                                                       pcbr_offset,
3878                                                                       I915_GTT_OFFSET_NONE,
3879                                                                       pctx_size);
3880                 goto out;
3881         }
3882
3883         /*
3884          * From the Gunit register HAS:
3885          * The Gfx driver is expected to program this register and ensure
3886          * proper allocation within Gfx stolen memory.  For example, this
3887          * register should be programmed such than the PCBR range does not
3888          * overlap with other ranges, such as the frame buffer, protected
3889          * memory, or any other relevant ranges.
3890          */
3891         pctx = i915_gem_object_create_stolen(dev, pctx_size);
3892         if (!pctx) {
3893                 DRM_DEBUG("not enough stolen space for PCTX, disabling\n");
3894                 return;
3895         }
3896
3897         pctx_paddr = dev_priv->mm.stolen_base + pctx->stolen->start;
3898         I915_WRITE(VLV_PCBR, pctx_paddr);
3899
3900 out:
3901         dev_priv->vlv_pctx = pctx;
3902 }
3903
3904 static void valleyview_enable_rps(struct drm_device *dev)
3905 {
3906         struct drm_i915_private *dev_priv = dev->dev_private;
3907         struct intel_ring_buffer *ring;
3908         u32 gtfifodbg, val, rc6_mode = 0;
3909         int i;
3910
3911         WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
3912
3913         if ((gtfifodbg = I915_READ(GTFIFODBG))) {
3914                 DRM_DEBUG_DRIVER("GT fifo had a previous error %x\n",
3915                                  gtfifodbg);
3916                 I915_WRITE(GTFIFODBG, gtfifodbg);
3917         }
3918
3919         valleyview_setup_pctx(dev);
3920
3921         gen6_gt_force_wake_get(dev_priv);
3922
3923         I915_WRITE(GEN6_RP_UP_THRESHOLD, 59400);
3924         I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 245000);
3925         I915_WRITE(GEN6_RP_UP_EI, 66000);
3926         I915_WRITE(GEN6_RP_DOWN_EI, 350000);
3927
3928         I915_WRITE(GEN6_RP_IDLE_HYSTERSIS, 10);
3929
3930         I915_WRITE(GEN6_RP_CONTROL,
3931                    GEN6_RP_MEDIA_TURBO |
3932                    GEN6_RP_MEDIA_HW_NORMAL_MODE |
3933                    GEN6_RP_MEDIA_IS_GFX |
3934                    GEN6_RP_ENABLE |
3935                    GEN6_RP_UP_BUSY_AVG |
3936                    GEN6_RP_DOWN_IDLE_CONT);
3937
3938         I915_WRITE(GEN6_RC6_WAKE_RATE_LIMIT, 0x00280000);
3939         I915_WRITE(GEN6_RC_EVALUATION_INTERVAL, 125000);
3940         I915_WRITE(GEN6_RC_IDLE_HYSTERSIS, 25);
3941
3942         for_each_ring(ring, dev_priv, i)
3943                 I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
3944
3945         I915_WRITE(GEN6_RC6_THRESHOLD, 0xc350);
3946
3947         /* allows RC6 residency counter to work */
3948         I915_WRITE(VLV_COUNTER_CONTROL,
3949                    _MASKED_BIT_ENABLE(VLV_COUNT_RANGE_HIGH |
3950                                       VLV_MEDIA_RC6_COUNT_EN |
3951                                       VLV_RENDER_RC6_COUNT_EN));
3952         if (intel_enable_rc6(dev) & INTEL_RC6_ENABLE)
3953                 rc6_mode = GEN7_RC_CTL_TO_MODE;
3954         I915_WRITE(GEN6_RC_CONTROL, rc6_mode);
3955
3956         val = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
3957         switch ((val >> 6) & 3) {
3958         case 0:
3959         case 1:
3960                 dev_priv->mem_freq = 800;
3961                 break;
3962         case 2:
3963                 dev_priv->mem_freq = 1066;
3964                 break;
3965         case 3:
3966                 dev_priv->mem_freq = 1333;
3967                 break;
3968         }
3969         DRM_DEBUG_DRIVER("DDR speed: %d MHz", dev_priv->mem_freq);
3970
3971         DRM_DEBUG_DRIVER("GPLL enabled? %s\n", val & 0x10 ? "yes" : "no");
3972         DRM_DEBUG_DRIVER("GPU status: 0x%08x\n", val);
3973
3974         dev_priv->rps.cur_delay = (val >> 8) & 0xff;
3975         DRM_DEBUG_DRIVER("current GPU freq: %d MHz (%u)\n",
3976                          vlv_gpu_freq(dev_priv->mem_freq,
3977                                       dev_priv->rps.cur_delay),
3978                          dev_priv->rps.cur_delay);
3979
3980         dev_priv->rps.max_delay = valleyview_rps_max_freq(dev_priv);
3981         dev_priv->rps.hw_max = dev_priv->rps.max_delay;
3982         DRM_DEBUG_DRIVER("max GPU freq: %d MHz (%u)\n",
3983                          vlv_gpu_freq(dev_priv->mem_freq,
3984                                       dev_priv->rps.max_delay),
3985                          dev_priv->rps.max_delay);
3986
3987         dev_priv->rps.rpe_delay = valleyview_rps_rpe_freq(dev_priv);
3988         DRM_DEBUG_DRIVER("RPe GPU freq: %d MHz (%u)\n",
3989                          vlv_gpu_freq(dev_priv->mem_freq,
3990                                       dev_priv->rps.rpe_delay),
3991                          dev_priv->rps.rpe_delay);
3992
3993         dev_priv->rps.min_delay = valleyview_rps_min_freq(dev_priv);
3994         DRM_DEBUG_DRIVER("min GPU freq: %d MHz (%u)\n",
3995                          vlv_gpu_freq(dev_priv->mem_freq,
3996                                       dev_priv->rps.min_delay),
3997                          dev_priv->rps.min_delay);
3998
3999         DRM_DEBUG_DRIVER("setting GPU freq to %d MHz (%u)\n",
4000                          vlv_gpu_freq(dev_priv->mem_freq,
4001                                       dev_priv->rps.rpe_delay),
4002                          dev_priv->rps.rpe_delay);
4003
4004         valleyview_set_rps(dev_priv->dev, dev_priv->rps.rpe_delay);
4005
4006         gen6_enable_rps_interrupts(dev);
4007
4008         gen6_gt_force_wake_put(dev_priv);
4009 }
4010
4011 void ironlake_teardown_rc6(struct drm_device *dev)
4012 {
4013         struct drm_i915_private *dev_priv = dev->dev_private;
4014
4015         if (dev_priv->ips.renderctx) {
4016                 i915_gem_object_unpin(dev_priv->ips.renderctx);
4017                 drm_gem_object_unreference(&dev_priv->ips.renderctx->base);
4018                 dev_priv->ips.renderctx = NULL;
4019         }
4020
4021         if (dev_priv->ips.pwrctx) {
4022                 i915_gem_object_unpin(dev_priv->ips.pwrctx);
4023                 drm_gem_object_unreference(&dev_priv->ips.pwrctx->base);
4024                 dev_priv->ips.pwrctx = NULL;
4025         }
4026 }
4027
4028 static void ironlake_disable_rc6(struct drm_device *dev)
4029 {
4030         struct drm_i915_private *dev_priv = dev->dev_private;
4031
4032         if (I915_READ(PWRCTXA)) {
4033                 /* Wake the GPU, prevent RC6, then restore RSTDBYCTL */
4034                 I915_WRITE(RSTDBYCTL, I915_READ(RSTDBYCTL) | RCX_SW_EXIT);
4035                 wait_for(((I915_READ(RSTDBYCTL) & RSX_STATUS_MASK) == RSX_STATUS_ON),
4036                          50);
4037
4038                 I915_WRITE(PWRCTXA, 0);
4039                 POSTING_READ(PWRCTXA);
4040
4041                 I915_WRITE(RSTDBYCTL, I915_READ(RSTDBYCTL) & ~RCX_SW_EXIT);
4042                 POSTING_READ(RSTDBYCTL);
4043         }
4044 }
4045
4046 static int ironlake_setup_rc6(struct drm_device *dev)
4047 {
4048         struct drm_i915_private *dev_priv = dev->dev_private;
4049
4050         if (dev_priv->ips.renderctx == NULL)
4051                 dev_priv->ips.renderctx = intel_alloc_context_page(dev);
4052         if (!dev_priv->ips.renderctx)
4053                 return -ENOMEM;
4054
4055         if (dev_priv->ips.pwrctx == NULL)
4056                 dev_priv->ips.pwrctx = intel_alloc_context_page(dev);
4057         if (!dev_priv->ips.pwrctx) {
4058                 ironlake_teardown_rc6(dev);
4059                 return -ENOMEM;
4060         }
4061
4062         return 0;
4063 }
4064
4065 static void ironlake_enable_rc6(struct drm_device *dev)
4066 {
4067         struct drm_i915_private *dev_priv = dev->dev_private;
4068         struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
4069         bool was_interruptible;
4070         int ret;
4071
4072         /* rc6 disabled by default due to repeated reports of hanging during
4073          * boot and resume.
4074          */
4075         if (!intel_enable_rc6(dev))
4076                 return;
4077
4078         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
4079
4080         ret = ironlake_setup_rc6(dev);
4081         if (ret)
4082                 return;
4083
4084         was_interruptible = dev_priv->mm.interruptible;
4085         dev_priv->mm.interruptible = false;
4086
4087         /*
4088          * GPU can automatically power down the render unit if given a page
4089          * to save state.
4090          */
4091         ret = intel_ring_begin(ring, 6);
4092         if (ret) {
4093                 ironlake_teardown_rc6(dev);
4094                 dev_priv->mm.interruptible = was_interruptible;
4095                 return;
4096         }
4097
4098         intel_ring_emit(ring, MI_SUSPEND_FLUSH | MI_SUSPEND_FLUSH_EN);
4099         intel_ring_emit(ring, MI_SET_CONTEXT);
4100         intel_ring_emit(ring, i915_gem_obj_ggtt_offset(dev_priv->ips.renderctx) |
4101                         MI_MM_SPACE_GTT |
4102                         MI_SAVE_EXT_STATE_EN |
4103                         MI_RESTORE_EXT_STATE_EN |
4104                         MI_RESTORE_INHIBIT);
4105         intel_ring_emit(ring, MI_SUSPEND_FLUSH);
4106         intel_ring_emit(ring, MI_NOOP);
4107         intel_ring_emit(ring, MI_FLUSH);
4108         intel_ring_advance(ring);
4109
4110         /*
4111          * Wait for the command parser to advance past MI_SET_CONTEXT. The HW
4112          * does an implicit flush, combined with MI_FLUSH above, it should be
4113          * safe to assume that renderctx is valid
4114          */
4115         ret = intel_ring_idle(ring);
4116         dev_priv->mm.interruptible = was_interruptible;
4117         if (ret) {
4118                 DRM_ERROR("failed to enable ironlake power savings\n");
4119                 ironlake_teardown_rc6(dev);
4120                 return;
4121         }
4122
4123         I915_WRITE(PWRCTXA, i915_gem_obj_ggtt_offset(dev_priv->ips.pwrctx) | PWRCTX_EN);
4124         I915_WRITE(RSTDBYCTL, I915_READ(RSTDBYCTL) & ~RCX_SW_EXIT);
4125 }
4126
4127 static unsigned long intel_pxfreq(u32 vidfreq)
4128 {
4129         unsigned long freq;
4130         int div = (vidfreq & 0x3f0000) >> 16;
4131         int post = (vidfreq & 0x3000) >> 12;
4132         int pre = (vidfreq & 0x7);
4133
4134         if (!pre)
4135                 return 0;
4136
4137         freq = ((div * 133333) / ((1<<post) * pre));
4138
4139         return freq;
4140 }
4141
4142 static const struct cparams {
4143         u16 i;
4144         u16 t;
4145         u16 m;
4146         u16 c;
4147 } cparams[] = {
4148         { 1, 1333, 301, 28664 },
4149         { 1, 1066, 294, 24460 },
4150         { 1, 800, 294, 25192 },
4151         { 0, 1333, 276, 27605 },
4152         { 0, 1066, 276, 27605 },
4153         { 0, 800, 231, 23784 },
4154 };
4155
4156 static unsigned long __i915_chipset_val(struct drm_i915_private *dev_priv)
4157 {
4158         u64 total_count, diff, ret;
4159         u32 count1, count2, count3, m = 0, c = 0;
4160         unsigned long now = jiffies_to_msecs(jiffies), diff1;
4161         int i;
4162
4163         assert_spin_locked(&mchdev_lock);
4164
4165         diff1 = now - dev_priv->ips.last_time1;
4166
4167         /* Prevent division-by-zero if we are asking too fast.
4168          * Also, we don't get interesting results if we are polling
4169          * faster than once in 10ms, so just return the saved value
4170          * in such cases.
4171          */
4172         if (diff1 <= 10)
4173                 return dev_priv->ips.chipset_power;
4174
4175         count1 = I915_READ(DMIEC);
4176         count2 = I915_READ(DDREC);
4177         count3 = I915_READ(CSIEC);
4178
4179         total_count = count1 + count2 + count3;
4180
4181         /* FIXME: handle per-counter overflow */
4182         if (total_count < dev_priv->ips.last_count1) {
4183                 diff = ~0UL - dev_priv->ips.last_count1;
4184                 diff += total_count;
4185         } else {
4186                 diff = total_count - dev_priv->ips.last_count1;
4187         }
4188
4189         for (i = 0; i < ARRAY_SIZE(cparams); i++) {
4190                 if (cparams[i].i == dev_priv->ips.c_m &&
4191                     cparams[i].t == dev_priv->ips.r_t) {
4192                         m = cparams[i].m;
4193                         c = cparams[i].c;
4194                         break;
4195                 }
4196         }
4197
4198         diff = div_u64(diff, diff1);
4199         ret = ((m * diff) + c);
4200         ret = div_u64(ret, 10);
4201
4202         dev_priv->ips.last_count1 = total_count;
4203         dev_priv->ips.last_time1 = now;
4204
4205         dev_priv->ips.chipset_power = ret;
4206
4207         return ret;
4208 }
4209
4210 unsigned long i915_chipset_val(struct drm_i915_private *dev_priv)
4211 {
4212         unsigned long val;
4213
4214         if (dev_priv->info->gen != 5)
4215                 return 0;
4216
4217         spin_lock_irq(&mchdev_lock);
4218
4219         val = __i915_chipset_val(dev_priv);
4220
4221         spin_unlock_irq(&mchdev_lock);
4222
4223         return val;
4224 }
4225
4226 unsigned long i915_mch_val(struct drm_i915_private *dev_priv)
4227 {
4228         unsigned long m, x, b;
4229         u32 tsfs;
4230
4231         tsfs = I915_READ(TSFS);
4232
4233         m = ((tsfs & TSFS_SLOPE_MASK) >> TSFS_SLOPE_SHIFT);
4234         x = I915_READ8(TR1);
4235
4236         b = tsfs & TSFS_INTR_MASK;
4237
4238         return ((m * x) / 127) - b;
4239 }
4240
4241 static u16 pvid_to_extvid(struct drm_i915_private *dev_priv, u8 pxvid)
4242 {
4243         static const struct v_table {
4244                 u16 vd; /* in .1 mil */
4245                 u16 vm; /* in .1 mil */
4246         } v_table[] = {
4247                 { 0, 0, },
4248                 { 375, 0, },
4249                 { 500, 0, },
4250                 { 625, 0, },
4251                 { 750, 0, },
4252                 { 875, 0, },
4253                 { 1000, 0, },
4254                 { 1125, 0, },
4255                 { 4125, 3000, },
4256                 { 4125, 3000, },
4257                 { 4125, 3000, },
4258                 { 4125, 3000, },
4259                 { 4125, 3000, },
4260                 { 4125, 3000, },
4261                 { 4125, 3000, },
4262                 { 4125, 3000, },
4263                 { 4125, 3000, },
4264                 { 4125, 3000, },
4265                 { 4125, 3000, },
4266                 { 4125, 3000, },
4267                 { 4125, 3000, },
4268                 { 4125, 3000, },
4269                 { 4125, 3000, },
4270                 { 4125, 3000, },
4271                 { 4125, 3000, },
4272                 { 4125, 3000, },
4273                 { 4125, 3000, },
4274                 { 4125, 3000, },
4275                 { 4125, 3000, },
4276                 { 4125, 3000, },
4277                 { 4125, 3000, },
4278                 { 4125, 3000, },
4279                 { 4250, 3125, },
4280                 { 4375, 3250, },
4281                 { 4500, 3375, },
4282                 { 4625, 3500, },
4283                 { 4750, 3625, },
4284                 { 4875, 3750, },
4285                 { 5000, 3875, },
4286                 { 5125, 4000, },
4287                 { 5250, 4125, },
4288                 { 5375, 4250, },
4289                 { 5500, 4375, },
4290                 { 5625, 4500, },
4291                 { 5750, 4625, },
4292                 { 5875, 4750, },
4293                 { 6000, 4875, },
4294                 { 6125, 5000, },
4295                 { 6250, 5125, },
4296                 { 6375, 5250, },
4297                 { 6500, 5375, },
4298                 { 6625, 5500, },
4299                 { 6750, 5625, },
4300                 { 6875, 5750, },
4301                 { 7000, 5875, },
4302                 { 7125, 6000, },
4303                 { 7250, 6125, },
4304                 { 7375, 6250, },
4305                 { 7500, 6375, },
4306                 { 7625, 6500, },
4307                 { 7750, 6625, },
4308                 { 7875, 6750, },
4309                 { 8000, 6875, },
4310                 { 8125, 7000, },
4311                 { 8250, 7125, },
4312                 { 8375, 7250, },
4313                 { 8500, 7375, },
4314                 { 8625, 7500, },
4315                 { 8750, 7625, },
4316                 { 8875, 7750, },
4317                 { 9000, 7875, },
4318                 { 9125, 8000, },
4319                 { 9250, 8125, },
4320                 { 9375, 8250, },
4321                 { 9500, 8375, },
4322                 { 9625, 8500, },
4323                 { 9750, 8625, },
4324                 { 9875, 8750, },
4325                 { 10000, 8875, },
4326                 { 10125, 9000, },
4327                 { 10250, 9125, },
4328                 { 10375, 9250, },
4329                 { 10500, 9375, },
4330                 { 10625, 9500, },
4331                 { 10750, 9625, },
4332                 { 10875, 9750, },
4333                 { 11000, 9875, },
4334                 { 11125, 10000, },
4335                 { 11250, 10125, },
4336                 { 11375, 10250, },
4337                 { 11500, 10375, },
4338                 { 11625, 10500, },
4339                 { 11750, 10625, },
4340                 { 11875, 10750, },
4341                 { 12000, 10875, },
4342                 { 12125, 11000, },
4343                 { 12250, 11125, },
4344                 { 12375, 11250, },
4345                 { 12500, 11375, },
4346                 { 12625, 11500, },
4347                 { 12750, 11625, },
4348                 { 12875, 11750, },
4349                 { 13000, 11875, },
4350                 { 13125, 12000, },
4351                 { 13250, 12125, },
4352                 { 13375, 12250, },
4353                 { 13500, 12375, },
4354                 { 13625, 12500, },
4355                 { 13750, 12625, },
4356                 { 13875, 12750, },
4357                 { 14000, 12875, },
4358                 { 14125, 13000, },
4359                 { 14250, 13125, },
4360                 { 14375, 13250, },
4361                 { 14500, 13375, },
4362                 { 14625, 13500, },
4363                 { 14750, 13625, },
4364                 { 14875, 13750, },
4365                 { 15000, 13875, },
4366                 { 15125, 14000, },
4367                 { 15250, 14125, },
4368                 { 15375, 14250, },
4369                 { 15500, 14375, },
4370                 { 15625, 14500, },
4371                 { 15750, 14625, },
4372                 { 15875, 14750, },
4373                 { 16000, 14875, },
4374                 { 16125, 15000, },
4375         };
4376         if (dev_priv->info->is_mobile)
4377                 return v_table[pxvid].vm;
4378         else
4379                 return v_table[pxvid].vd;
4380 }
4381
4382 static void __i915_update_gfx_val(struct drm_i915_private *dev_priv)
4383 {
4384         struct timespec now, diff1;
4385         u64 diff;
4386         unsigned long diffms;
4387         u32 count;
4388
4389         assert_spin_locked(&mchdev_lock);
4390
4391         getrawmonotonic(&now);
4392         diff1 = timespec_sub(now, dev_priv->ips.last_time2);
4393
4394         /* Don't divide by 0 */
4395         diffms = diff1.tv_sec * 1000 + diff1.tv_nsec / 1000000;
4396         if (!diffms)
4397                 return;
4398
4399         count = I915_READ(GFXEC);
4400
4401         if (count < dev_priv->ips.last_count2) {
4402                 diff = ~0UL - dev_priv->ips.last_count2;
4403                 diff += count;
4404         } else {
4405                 diff = count - dev_priv->ips.last_count2;
4406         }
4407
4408         dev_priv->ips.last_count2 = count;
4409         dev_priv->ips.last_time2 = now;
4410
4411         /* More magic constants... */
4412         diff = diff * 1181;
4413         diff = div_u64(diff, diffms * 10);
4414         dev_priv->ips.gfx_power = diff;
4415 }
4416
4417 void i915_update_gfx_val(struct drm_i915_private *dev_priv)
4418 {
4419         if (dev_priv->info->gen != 5)
4420                 return;
4421
4422         spin_lock_irq(&mchdev_lock);
4423
4424         __i915_update_gfx_val(dev_priv);
4425
4426         spin_unlock_irq(&mchdev_lock);
4427 }
4428
4429 static unsigned long __i915_gfx_val(struct drm_i915_private *dev_priv)
4430 {
4431         unsigned long t, corr, state1, corr2, state2;
4432         u32 pxvid, ext_v;
4433
4434         assert_spin_locked(&mchdev_lock);
4435
4436         pxvid = I915_READ(PXVFREQ_BASE + (dev_priv->rps.cur_delay * 4));
4437         pxvid = (pxvid >> 24) & 0x7f;
4438         ext_v = pvid_to_extvid(dev_priv, pxvid);
4439
4440         state1 = ext_v;
4441
4442         t = i915_mch_val(dev_priv);
4443
4444         /* Revel in the empirically derived constants */
4445
4446         /* Correction factor in 1/100000 units */
4447         if (t > 80)
4448                 corr = ((t * 2349) + 135940);
4449         else if (t >= 50)
4450                 corr = ((t * 964) + 29317);
4451         else /* < 50 */
4452                 corr = ((t * 301) + 1004);
4453
4454         corr = corr * ((150142 * state1) / 10000 - 78642);
4455         corr /= 100000;
4456         corr2 = (corr * dev_priv->ips.corr);
4457
4458         state2 = (corr2 * state1) / 10000;
4459         state2 /= 100; /* convert to mW */
4460
4461         __i915_update_gfx_val(dev_priv);
4462
4463         return dev_priv->ips.gfx_power + state2;
4464 }
4465
4466 unsigned long i915_gfx_val(struct drm_i915_private *dev_priv)
4467 {
4468         unsigned long val;
4469
4470         if (dev_priv->info->gen != 5)
4471                 return 0;
4472
4473         spin_lock_irq(&mchdev_lock);
4474
4475         val = __i915_gfx_val(dev_priv);
4476
4477         spin_unlock_irq(&mchdev_lock);
4478
4479         return val;
4480 }
4481
4482 /**
4483  * i915_read_mch_val - return value for IPS use
4484  *
4485  * Calculate and return a value for the IPS driver to use when deciding whether
4486  * we have thermal and power headroom to increase CPU or GPU power budget.
4487  */
4488 unsigned long i915_read_mch_val(void)
4489 {
4490         struct drm_i915_private *dev_priv;
4491         unsigned long chipset_val, graphics_val, ret = 0;
4492
4493         spin_lock_irq(&mchdev_lock);
4494         if (!i915_mch_dev)
4495                 goto out_unlock;
4496         dev_priv = i915_mch_dev;
4497
4498         chipset_val = __i915_chipset_val(dev_priv);
4499         graphics_val = __i915_gfx_val(dev_priv);
4500
4501         ret = chipset_val + graphics_val;
4502
4503 out_unlock:
4504         spin_unlock_irq(&mchdev_lock);
4505
4506         return ret;
4507 }
4508 EXPORT_SYMBOL_GPL(i915_read_mch_val);
4509
4510 /**
4511  * i915_gpu_raise - raise GPU frequency limit
4512  *
4513  * Raise the limit; IPS indicates we have thermal headroom.
4514  */
4515 bool i915_gpu_raise(void)
4516 {
4517         struct drm_i915_private *dev_priv;
4518         bool ret = true;
4519
4520         spin_lock_irq(&mchdev_lock);
4521         if (!i915_mch_dev) {
4522                 ret = false;
4523                 goto out_unlock;
4524         }
4525         dev_priv = i915_mch_dev;
4526
4527         if (dev_priv->ips.max_delay > dev_priv->ips.fmax)
4528                 dev_priv->ips.max_delay--;
4529
4530 out_unlock:
4531         spin_unlock_irq(&mchdev_lock);
4532
4533         return ret;
4534 }
4535 EXPORT_SYMBOL_GPL(i915_gpu_raise);
4536
4537 /**
4538  * i915_gpu_lower - lower GPU frequency limit
4539  *
4540  * IPS indicates we're close to a thermal limit, so throttle back the GPU
4541  * frequency maximum.
4542  */
4543 bool i915_gpu_lower(void)
4544 {
4545         struct drm_i915_private *dev_priv;
4546         bool ret = true;
4547
4548         spin_lock_irq(&mchdev_lock);
4549         if (!i915_mch_dev) {
4550                 ret = false;
4551                 goto out_unlock;
4552         }
4553         dev_priv = i915_mch_dev;
4554
4555         if (dev_priv->ips.max_delay < dev_priv->ips.min_delay)
4556                 dev_priv->ips.max_delay++;
4557
4558 out_unlock:
4559         spin_unlock_irq(&mchdev_lock);
4560
4561         return ret;
4562 }
4563 EXPORT_SYMBOL_GPL(i915_gpu_lower);
4564
4565 /**
4566  * i915_gpu_busy - indicate GPU business to IPS
4567  *
4568  * Tell the IPS driver whether or not the GPU is busy.
4569  */
4570 bool i915_gpu_busy(void)
4571 {
4572         struct drm_i915_private *dev_priv;
4573         struct intel_ring_buffer *ring;
4574         bool ret = false;
4575         int i;
4576
4577         spin_lock_irq(&mchdev_lock);
4578         if (!i915_mch_dev)
4579                 goto out_unlock;
4580         dev_priv = i915_mch_dev;
4581
4582         for_each_ring(ring, dev_priv, i)
4583                 ret |= !list_empty(&ring->request_list);
4584
4585 out_unlock:
4586         spin_unlock_irq(&mchdev_lock);
4587
4588         return ret;
4589 }
4590 EXPORT_SYMBOL_GPL(i915_gpu_busy);
4591
4592 /**
4593  * i915_gpu_turbo_disable - disable graphics turbo
4594  *
4595  * Disable graphics turbo by resetting the max frequency and setting the
4596  * current frequency to the default.
4597  */
4598 bool i915_gpu_turbo_disable(void)
4599 {
4600         struct drm_i915_private *dev_priv;
4601         bool ret = true;
4602
4603         spin_lock_irq(&mchdev_lock);
4604         if (!i915_mch_dev) {
4605                 ret = false;
4606                 goto out_unlock;
4607         }
4608         dev_priv = i915_mch_dev;
4609
4610         dev_priv->ips.max_delay = dev_priv->ips.fstart;
4611
4612         if (!ironlake_set_drps(dev_priv->dev, dev_priv->ips.fstart))
4613                 ret = false;
4614
4615 out_unlock:
4616         spin_unlock_irq(&mchdev_lock);
4617
4618         return ret;
4619 }
4620 EXPORT_SYMBOL_GPL(i915_gpu_turbo_disable);
4621
4622 /**
4623  * Tells the intel_ips driver that the i915 driver is now loaded, if
4624  * IPS got loaded first.
4625  *
4626  * This awkward dance is so that neither module has to depend on the
4627  * other in order for IPS to do the appropriate communication of
4628  * GPU turbo limits to i915.
4629  */
4630 static void
4631 ips_ping_for_i915_load(void)
4632 {
4633         void (*link)(void);
4634
4635         link = symbol_get(ips_link_to_i915_driver);
4636         if (link) {
4637                 link();
4638                 symbol_put(ips_link_to_i915_driver);
4639         }
4640 }
4641
4642 void intel_gpu_ips_init(struct drm_i915_private *dev_priv)
4643 {
4644         /* We only register the i915 ips part with intel-ips once everything is
4645          * set up, to avoid intel-ips sneaking in and reading bogus values. */
4646         spin_lock_irq(&mchdev_lock);
4647         i915_mch_dev = dev_priv;
4648         spin_unlock_irq(&mchdev_lock);
4649
4650         ips_ping_for_i915_load();
4651 }
4652
4653 void intel_gpu_ips_teardown(void)
4654 {
4655         spin_lock_irq(&mchdev_lock);
4656         i915_mch_dev = NULL;
4657         spin_unlock_irq(&mchdev_lock);
4658 }
4659 static void intel_init_emon(struct drm_device *dev)
4660 {
4661         struct drm_i915_private *dev_priv = dev->dev_private;
4662         u32 lcfuse;
4663         u8 pxw[16];
4664         int i;
4665
4666         /* Disable to program */
4667         I915_WRITE(ECR, 0);
4668         POSTING_READ(ECR);
4669
4670         /* Program energy weights for various events */
4671         I915_WRITE(SDEW, 0x15040d00);
4672         I915_WRITE(CSIEW0, 0x007f0000);
4673         I915_WRITE(CSIEW1, 0x1e220004);
4674         I915_WRITE(CSIEW2, 0x04000004);
4675
4676         for (i = 0; i < 5; i++)
4677                 I915_WRITE(PEW + (i * 4), 0);
4678         for (i = 0; i < 3; i++)
4679                 I915_WRITE(DEW + (i * 4), 0);
4680
4681         /* Program P-state weights to account for frequency power adjustment */
4682         for (i = 0; i < 16; i++) {
4683                 u32 pxvidfreq = I915_READ(PXVFREQ_BASE + (i * 4));
4684                 unsigned long freq = intel_pxfreq(pxvidfreq);
4685                 unsigned long vid = (pxvidfreq & PXVFREQ_PX_MASK) >>
4686                         PXVFREQ_PX_SHIFT;
4687                 unsigned long val;
4688
4689                 val = vid * vid;
4690                 val *= (freq / 1000);
4691                 val *= 255;
4692                 val /= (127*127*900);
4693                 if (val > 0xff)
4694                         DRM_ERROR("bad pxval: %ld\n", val);
4695                 pxw[i] = val;
4696         }
4697         /* Render standby states get 0 weight */
4698         pxw[14] = 0;
4699         pxw[15] = 0;
4700
4701         for (i = 0; i < 4; i++) {
4702                 u32 val = (pxw[i*4] << 24) | (pxw[(i*4)+1] << 16) |
4703                         (pxw[(i*4)+2] << 8) | (pxw[(i*4)+3]);
4704                 I915_WRITE(PXW + (i * 4), val);
4705         }
4706
4707         /* Adjust magic regs to magic values (more experimental results) */
4708         I915_WRITE(OGW0, 0);
4709         I915_WRITE(OGW1, 0);
4710         I915_WRITE(EG0, 0x00007f00);
4711         I915_WRITE(EG1, 0x0000000e);
4712         I915_WRITE(EG2, 0x000e0000);
4713         I915_WRITE(EG3, 0x68000300);
4714         I915_WRITE(EG4, 0x42000000);
4715         I915_WRITE(EG5, 0x00140031);
4716         I915_WRITE(EG6, 0);
4717         I915_WRITE(EG7, 0);
4718
4719         for (i = 0; i < 8; i++)
4720                 I915_WRITE(PXWL + (i * 4), 0);
4721
4722         /* Enable PMON + select events */
4723         I915_WRITE(ECR, 0x80000019);
4724
4725         lcfuse = I915_READ(LCFUSE02);
4726
4727         dev_priv->ips.corr = (lcfuse & LCFUSE_HIV_MASK);
4728 }
4729
4730 void intel_disable_gt_powersave(struct drm_device *dev)
4731 {
4732         struct drm_i915_private *dev_priv = dev->dev_private;
4733
4734         /* Interrupts should be disabled already to avoid re-arming. */
4735         WARN_ON(dev->irq_enabled);
4736
4737         if (IS_IRONLAKE_M(dev)) {
4738                 ironlake_disable_drps(dev);
4739                 ironlake_disable_rc6(dev);
4740         } else if (INTEL_INFO(dev)->gen >= 6) {
4741                 cancel_delayed_work_sync(&dev_priv->rps.delayed_resume_work);
4742                 cancel_work_sync(&dev_priv->rps.work);
4743                 mutex_lock(&dev_priv->rps.hw_lock);
4744                 if (IS_VALLEYVIEW(dev))
4745                         valleyview_disable_rps(dev);
4746                 else
4747                         gen6_disable_rps(dev);
4748                 dev_priv->rps.enabled = false;
4749                 mutex_unlock(&dev_priv->rps.hw_lock);
4750         }
4751 }
4752
4753 static void intel_gen6_powersave_work(struct work_struct *work)
4754 {
4755         struct drm_i915_private *dev_priv =
4756                 container_of(work, struct drm_i915_private,
4757                              rps.delayed_resume_work.work);
4758         struct drm_device *dev = dev_priv->dev;
4759
4760         mutex_lock(&dev_priv->rps.hw_lock);
4761
4762         if (IS_VALLEYVIEW(dev)) {
4763                 valleyview_enable_rps(dev);
4764         } else {
4765                 gen6_enable_rps(dev);
4766                 gen6_update_ring_freq(dev);
4767         }
4768         dev_priv->rps.enabled = true;
4769         mutex_unlock(&dev_priv->rps.hw_lock);
4770 }
4771
4772 void intel_enable_gt_powersave(struct drm_device *dev)
4773 {
4774         struct drm_i915_private *dev_priv = dev->dev_private;
4775
4776         if (IS_IRONLAKE_M(dev)) {
4777                 ironlake_enable_drps(dev);
4778                 ironlake_enable_rc6(dev);
4779                 intel_init_emon(dev);
4780         } else if (IS_GEN6(dev) || IS_GEN7(dev)) {
4781                 /*
4782                  * PCU communication is slow and this doesn't need to be
4783                  * done at any specific time, so do this out of our fast path
4784                  * to make resume and init faster.
4785                  */
4786                 schedule_delayed_work(&dev_priv->rps.delayed_resume_work,
4787                                       round_jiffies_up_relative(HZ));
4788         }
4789 }
4790
4791 static void ibx_init_clock_gating(struct drm_device *dev)
4792 {
4793         struct drm_i915_private *dev_priv = dev->dev_private;
4794
4795         /*
4796          * On Ibex Peak and Cougar Point, we need to disable clock
4797          * gating for the panel power sequencer or it will fail to
4798          * start up when no ports are active.
4799          */
4800         I915_WRITE(SOUTH_DSPCLK_GATE_D, PCH_DPLSUNIT_CLOCK_GATE_DISABLE);
4801 }
4802
4803 static void g4x_disable_trickle_feed(struct drm_device *dev)
4804 {
4805         struct drm_i915_private *dev_priv = dev->dev_private;
4806         int pipe;
4807
4808         for_each_pipe(pipe) {
4809                 I915_WRITE(DSPCNTR(pipe),
4810                            I915_READ(DSPCNTR(pipe)) |
4811                            DISPPLANE_TRICKLE_FEED_DISABLE);
4812                 intel_flush_primary_plane(dev_priv, pipe);
4813         }
4814 }
4815
4816 static void ironlake_init_clock_gating(struct drm_device *dev)
4817 {
4818         struct drm_i915_private *dev_priv = dev->dev_private;
4819         uint32_t dspclk_gate = ILK_VRHUNIT_CLOCK_GATE_DISABLE;
4820
4821         /*
4822          * Required for FBC
4823          * WaFbcDisableDpfcClockGating:ilk
4824          */
4825         dspclk_gate |= ILK_DPFCRUNIT_CLOCK_GATE_DISABLE |
4826                    ILK_DPFCUNIT_CLOCK_GATE_DISABLE |
4827                    ILK_DPFDUNIT_CLOCK_GATE_ENABLE;
4828
4829         I915_WRITE(PCH_3DCGDIS0,
4830                    MARIUNIT_CLOCK_GATE_DISABLE |
4831                    SVSMUNIT_CLOCK_GATE_DISABLE);
4832         I915_WRITE(PCH_3DCGDIS1,
4833                    VFMUNIT_CLOCK_GATE_DISABLE);
4834
4835         /*
4836          * According to the spec the following bits should be set in
4837          * order to enable memory self-refresh
4838          * The bit 22/21 of 0x42004
4839          * The bit 5 of 0x42020
4840          * The bit 15 of 0x45000
4841          */
4842         I915_WRITE(ILK_DISPLAY_CHICKEN2,
4843                    (I915_READ(ILK_DISPLAY_CHICKEN2) |
4844                     ILK_DPARB_GATE | ILK_VSDPFD_FULL));
4845         dspclk_gate |= ILK_DPARBUNIT_CLOCK_GATE_ENABLE;
4846         I915_WRITE(DISP_ARB_CTL,
4847                    (I915_READ(DISP_ARB_CTL) |
4848                     DISP_FBC_WM_DIS));
4849         I915_WRITE(WM3_LP_ILK, 0);
4850         I915_WRITE(WM2_LP_ILK, 0);
4851         I915_WRITE(WM1_LP_ILK, 0);
4852
4853         /*
4854          * Based on the document from hardware guys the following bits
4855          * should be set unconditionally in order to enable FBC.
4856          * The bit 22 of 0x42000
4857          * The bit 22 of 0x42004
4858          * The bit 7,8,9 of 0x42020.
4859          */
4860         if (IS_IRONLAKE_M(dev)) {
4861                 /* WaFbcAsynchFlipDisableFbcQueue:ilk */
4862                 I915_WRITE(ILK_DISPLAY_CHICKEN1,
4863                            I915_READ(ILK_DISPLAY_CHICKEN1) |
4864                            ILK_FBCQ_DIS);
4865                 I915_WRITE(ILK_DISPLAY_CHICKEN2,
4866                            I915_READ(ILK_DISPLAY_CHICKEN2) |
4867                            ILK_DPARB_GATE);
4868         }
4869
4870         I915_WRITE(ILK_DSPCLK_GATE_D, dspclk_gate);
4871
4872         I915_WRITE(ILK_DISPLAY_CHICKEN2,
4873                    I915_READ(ILK_DISPLAY_CHICKEN2) |
4874                    ILK_ELPIN_409_SELECT);
4875         I915_WRITE(_3D_CHICKEN2,
4876                    _3D_CHICKEN2_WM_READ_PIPELINED << 16 |
4877                    _3D_CHICKEN2_WM_READ_PIPELINED);
4878
4879         /* WaDisableRenderCachePipelinedFlush:ilk */
4880         I915_WRITE(CACHE_MODE_0,
4881                    _MASKED_BIT_ENABLE(CM0_PIPELINED_RENDER_FLUSH_DISABLE));
4882
4883         g4x_disable_trickle_feed(dev);
4884
4885         ibx_init_clock_gating(dev);
4886 }
4887
4888 static void cpt_init_clock_gating(struct drm_device *dev)
4889 {
4890         struct drm_i915_private *dev_priv = dev->dev_private;
4891         int pipe;
4892         uint32_t val;
4893
4894         /*
4895          * On Ibex Peak and Cougar Point, we need to disable clock
4896          * gating for the panel power sequencer or it will fail to
4897          * start up when no ports are active.
4898          */
4899         I915_WRITE(SOUTH_DSPCLK_GATE_D, PCH_DPLSUNIT_CLOCK_GATE_DISABLE);
4900         I915_WRITE(SOUTH_CHICKEN2, I915_READ(SOUTH_CHICKEN2) |
4901                    DPLS_EDP_PPS_FIX_DIS);
4902         /* The below fixes the weird display corruption, a few pixels shifted
4903          * downward, on (only) LVDS of some HP laptops with IVY.
4904          */
4905         for_each_pipe(pipe) {
4906                 val = I915_READ(TRANS_CHICKEN2(pipe));
4907                 val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
4908                 val &= ~TRANS_CHICKEN2_FDI_POLARITY_REVERSED;
4909                 if (dev_priv->vbt.fdi_rx_polarity_inverted)
4910                         val |= TRANS_CHICKEN2_FDI_POLARITY_REVERSED;
4911                 val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
4912                 val &= ~TRANS_CHICKEN2_DISABLE_DEEP_COLOR_COUNTER;
4913                 val &= ~TRANS_CHICKEN2_DISABLE_DEEP_COLOR_MODESWITCH;
4914                 I915_WRITE(TRANS_CHICKEN2(pipe), val);
4915         }
4916         /* WADP0ClockGatingDisable */
4917         for_each_pipe(pipe) {
4918                 I915_WRITE(TRANS_CHICKEN1(pipe),
4919                            TRANS_CHICKEN1_DP0UNIT_GC_DISABLE);
4920         }
4921 }
4922
4923 static void gen6_check_mch_setup(struct drm_device *dev)
4924 {
4925         struct drm_i915_private *dev_priv = dev->dev_private;
4926         uint32_t tmp;
4927
4928         tmp = I915_READ(MCH_SSKPD);
4929         if ((tmp & MCH_SSKPD_WM0_MASK) != MCH_SSKPD_WM0_VAL) {
4930                 DRM_INFO("Wrong MCH_SSKPD value: 0x%08x\n", tmp);
4931                 DRM_INFO("This can cause pipe underruns and display issues.\n");
4932                 DRM_INFO("Please upgrade your BIOS to fix this.\n");
4933         }
4934 }
4935
4936 static void gen6_init_clock_gating(struct drm_device *dev)
4937 {
4938         struct drm_i915_private *dev_priv = dev->dev_private;
4939         uint32_t dspclk_gate = ILK_VRHUNIT_CLOCK_GATE_DISABLE;
4940
4941         I915_WRITE(ILK_DSPCLK_GATE_D, dspclk_gate);
4942
4943         I915_WRITE(ILK_DISPLAY_CHICKEN2,
4944                    I915_READ(ILK_DISPLAY_CHICKEN2) |
4945                    ILK_ELPIN_409_SELECT);
4946
4947         /* WaDisableHiZPlanesWhenMSAAEnabled:snb */
4948         I915_WRITE(_3D_CHICKEN,
4949                    _MASKED_BIT_ENABLE(_3D_CHICKEN_HIZ_PLANE_DISABLE_MSAA_4X_SNB));
4950
4951         /* WaSetupGtModeTdRowDispatch:snb */
4952         if (IS_SNB_GT1(dev))
4953                 I915_WRITE(GEN6_GT_MODE,
4954                            _MASKED_BIT_ENABLE(GEN6_TD_FOUR_ROW_DISPATCH_DISABLE));
4955
4956         I915_WRITE(WM3_LP_ILK, 0);
4957         I915_WRITE(WM2_LP_ILK, 0);
4958         I915_WRITE(WM1_LP_ILK, 0);
4959
4960         I915_WRITE(CACHE_MODE_0,
4961                    _MASKED_BIT_DISABLE(CM0_STC_EVICT_DISABLE_LRA_SNB));
4962
4963         I915_WRITE(GEN6_UCGCTL1,
4964                    I915_READ(GEN6_UCGCTL1) |
4965                    GEN6_BLBUNIT_CLOCK_GATE_DISABLE |
4966                    GEN6_CSUNIT_CLOCK_GATE_DISABLE);
4967
4968         /* According to the BSpec vol1g, bit 12 (RCPBUNIT) clock
4969          * gating disable must be set.  Failure to set it results in
4970          * flickering pixels due to Z write ordering failures after
4971          * some amount of runtime in the Mesa "fire" demo, and Unigine
4972          * Sanctuary and Tropics, and apparently anything else with
4973          * alpha test or pixel discard.
4974          *
4975          * According to the spec, bit 11 (RCCUNIT) must also be set,
4976          * but we didn't debug actual testcases to find it out.
4977          *
4978          * Also apply WaDisableVDSUnitClockGating:snb and
4979          * WaDisableRCPBUnitClockGating:snb.
4980          */
4981         I915_WRITE(GEN6_UCGCTL2,
4982                    GEN7_VDSUNIT_CLOCK_GATE_DISABLE |
4983                    GEN6_RCPBUNIT_CLOCK_GATE_DISABLE |
4984                    GEN6_RCCUNIT_CLOCK_GATE_DISABLE);
4985
4986         /* Bspec says we need to always set all mask bits. */
4987         I915_WRITE(_3D_CHICKEN3, (0xFFFF << 16) |
4988                    _3D_CHICKEN3_SF_DISABLE_FASTCLIP_CULL);
4989
4990         /*
4991          * According to the spec the following bits should be
4992          * set in order to enable memory self-refresh and fbc:
4993          * The bit21 and bit22 of 0x42000
4994          * The bit21 and bit22 of 0x42004
4995          * The bit5 and bit7 of 0x42020
4996          * The bit14 of 0x70180
4997          * The bit14 of 0x71180
4998          *
4999          * WaFbcAsynchFlipDisableFbcQueue:snb
5000          */
5001         I915_WRITE(ILK_DISPLAY_CHICKEN1,
5002                    I915_READ(ILK_DISPLAY_CHICKEN1) |
5003                    ILK_FBCQ_DIS | ILK_PABSTRETCH_DIS);
5004         I915_WRITE(ILK_DISPLAY_CHICKEN2,
5005                    I915_READ(ILK_DISPLAY_CHICKEN2) |
5006                    ILK_DPARB_GATE | ILK_VSDPFD_FULL);
5007         I915_WRITE(ILK_DSPCLK_GATE_D,
5008                    I915_READ(ILK_DSPCLK_GATE_D) |
5009                    ILK_DPARBUNIT_CLOCK_GATE_ENABLE  |
5010                    ILK_DPFDUNIT_CLOCK_GATE_ENABLE);
5011
5012         g4x_disable_trickle_feed(dev);
5013
5014         /* The default value should be 0x200 according to docs, but the two
5015          * platforms I checked have a 0 for this. (Maybe BIOS overrides?) */
5016         I915_WRITE(GEN6_GT_MODE, _MASKED_BIT_DISABLE(0xffff));
5017         I915_WRITE(GEN6_GT_MODE, _MASKED_BIT_ENABLE(GEN6_GT_MODE_HI));
5018
5019         cpt_init_clock_gating(dev);
5020
5021         gen6_check_mch_setup(dev);
5022 }
5023
5024 static void gen7_setup_fixed_func_scheduler(struct drm_i915_private *dev_priv)
5025 {
5026         uint32_t reg = I915_READ(GEN7_FF_THREAD_MODE);
5027
5028         reg &= ~GEN7_FF_SCHED_MASK;
5029         reg |= GEN7_FF_TS_SCHED_HW;
5030         reg |= GEN7_FF_VS_SCHED_HW;
5031         reg |= GEN7_FF_DS_SCHED_HW;
5032
5033         if (IS_HASWELL(dev_priv->dev))
5034                 reg &= ~GEN7_FF_VS_REF_CNT_FFME;
5035
5036         I915_WRITE(GEN7_FF_THREAD_MODE, reg);
5037 }
5038
5039 static void lpt_init_clock_gating(struct drm_device *dev)
5040 {
5041         struct drm_i915_private *dev_priv = dev->dev_private;
5042
5043         /*
5044          * TODO: this bit should only be enabled when really needed, then
5045          * disabled when not needed anymore in order to save power.
5046          */
5047         if (dev_priv->pch_id == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE)
5048                 I915_WRITE(SOUTH_DSPCLK_GATE_D,
5049                            I915_READ(SOUTH_DSPCLK_GATE_D) |
5050                            PCH_LP_PARTITION_LEVEL_DISABLE);
5051
5052         /* WADPOClockGatingDisable:hsw */
5053         I915_WRITE(_TRANSA_CHICKEN1,
5054                    I915_READ(_TRANSA_CHICKEN1) |
5055                    TRANS_CHICKEN1_DP0UNIT_GC_DISABLE);
5056 }
5057
5058 static void lpt_suspend_hw(struct drm_device *dev)
5059 {
5060         struct drm_i915_private *dev_priv = dev->dev_private;
5061
5062         if (dev_priv->pch_id == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE) {
5063                 uint32_t val = I915_READ(SOUTH_DSPCLK_GATE_D);
5064
5065                 val &= ~PCH_LP_PARTITION_LEVEL_DISABLE;
5066                 I915_WRITE(SOUTH_DSPCLK_GATE_D, val);
5067         }
5068 }
5069
5070 static void haswell_init_clock_gating(struct drm_device *dev)
5071 {
5072         struct drm_i915_private *dev_priv = dev->dev_private;
5073
5074         I915_WRITE(WM3_LP_ILK, 0);
5075         I915_WRITE(WM2_LP_ILK, 0);
5076         I915_WRITE(WM1_LP_ILK, 0);
5077
5078         /* According to the spec, bit 13 (RCZUNIT) must be set on IVB.
5079          * This implements the WaDisableRCZUnitClockGating:hsw workaround.
5080          */
5081         I915_WRITE(GEN6_UCGCTL2, GEN6_RCZUNIT_CLOCK_GATE_DISABLE);
5082
5083         /* Apply the WaDisableRHWOOptimizationForRenderHang:hsw workaround. */
5084         I915_WRITE(GEN7_COMMON_SLICE_CHICKEN1,
5085                    GEN7_CSC1_RHWO_OPT_DISABLE_IN_RCC);
5086
5087         /* WaApplyL3ControlAndL3ChickenMode:hsw */
5088         I915_WRITE(GEN7_L3CNTLREG1,
5089                         GEN7_WA_FOR_GEN7_L3_CONTROL);
5090         I915_WRITE(GEN7_L3_CHICKEN_MODE_REGISTER,
5091                         GEN7_WA_L3_CHICKEN_MODE);
5092
5093         /* This is required by WaCatErrorRejectionIssue:hsw */
5094         I915_WRITE(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
5095                         I915_READ(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG) |
5096                         GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
5097
5098         /* WaVSRefCountFullforceMissDisable:hsw */
5099         gen7_setup_fixed_func_scheduler(dev_priv);
5100
5101         /* WaDisable4x2SubspanOptimization:hsw */
5102         I915_WRITE(CACHE_MODE_1,
5103                    _MASKED_BIT_ENABLE(PIXEL_SUBSPAN_COLLECT_OPT_DISABLE));
5104
5105         /* WaSwitchSolVfFArbitrationPriority:hsw */
5106         I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);
5107
5108         /* WaRsPkgCStateDisplayPMReq:hsw */
5109         I915_WRITE(CHICKEN_PAR1_1,
5110                    I915_READ(CHICKEN_PAR1_1) | FORCE_ARB_IDLE_PLANES);
5111
5112         lpt_init_clock_gating(dev);
5113 }
5114
5115 static void ivybridge_init_clock_gating(struct drm_device *dev)
5116 {
5117         struct drm_i915_private *dev_priv = dev->dev_private;
5118         uint32_t snpcr;
5119
5120         I915_WRITE(WM3_LP_ILK, 0);
5121         I915_WRITE(WM2_LP_ILK, 0);
5122         I915_WRITE(WM1_LP_ILK, 0);
5123
5124         I915_WRITE(ILK_DSPCLK_GATE_D, ILK_VRHUNIT_CLOCK_GATE_DISABLE);
5125
5126         /* WaDisableEarlyCull:ivb */
5127         I915_WRITE(_3D_CHICKEN3,
5128                    _MASKED_BIT_ENABLE(_3D_CHICKEN_SF_DISABLE_OBJEND_CULL));
5129
5130         /* WaDisableBackToBackFlipFix:ivb */
5131         I915_WRITE(IVB_CHICKEN3,
5132                    CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE |
5133                    CHICKEN3_DGMG_DONE_FIX_DISABLE);
5134
5135         /* WaDisablePSDDualDispatchEnable:ivb */
5136         if (IS_IVB_GT1(dev))
5137                 I915_WRITE(GEN7_HALF_SLICE_CHICKEN1,
5138                            _MASKED_BIT_ENABLE(GEN7_PSD_SINGLE_PORT_DISPATCH_ENABLE));
5139         else
5140                 I915_WRITE(GEN7_HALF_SLICE_CHICKEN1_GT2,
5141                            _MASKED_BIT_ENABLE(GEN7_PSD_SINGLE_PORT_DISPATCH_ENABLE));
5142
5143         /* Apply the WaDisableRHWOOptimizationForRenderHang:ivb workaround. */
5144         I915_WRITE(GEN7_COMMON_SLICE_CHICKEN1,
5145                    GEN7_CSC1_RHWO_OPT_DISABLE_IN_RCC);
5146
5147         /* WaApplyL3ControlAndL3ChickenMode:ivb */
5148         I915_WRITE(GEN7_L3CNTLREG1,
5149                         GEN7_WA_FOR_GEN7_L3_CONTROL);
5150         I915_WRITE(GEN7_L3_CHICKEN_MODE_REGISTER,
5151                    GEN7_WA_L3_CHICKEN_MODE);
5152         if (IS_IVB_GT1(dev))
5153                 I915_WRITE(GEN7_ROW_CHICKEN2,
5154                            _MASKED_BIT_ENABLE(DOP_CLOCK_GATING_DISABLE));
5155         else
5156                 I915_WRITE(GEN7_ROW_CHICKEN2_GT2,
5157                            _MASKED_BIT_ENABLE(DOP_CLOCK_GATING_DISABLE));
5158
5159
5160         /* WaForceL3Serialization:ivb */
5161         I915_WRITE(GEN7_L3SQCREG4, I915_READ(GEN7_L3SQCREG4) &
5162                    ~L3SQ_URB_READ_CAM_MATCH_DISABLE);
5163
5164         /* According to the BSpec vol1g, bit 12 (RCPBUNIT) clock
5165          * gating disable must be set.  Failure to set it results in
5166          * flickering pixels due to Z write ordering failures after
5167          * some amount of runtime in the Mesa "fire" demo, and Unigine
5168          * Sanctuary and Tropics, and apparently anything else with
5169          * alpha test or pixel discard.
5170          *
5171          * According to the spec, bit 11 (RCCUNIT) must also be set,
5172          * but we didn't debug actual testcases to find it out.
5173          *
5174          * According to the spec, bit 13 (RCZUNIT) must be set on IVB.
5175          * This implements the WaDisableRCZUnitClockGating:ivb workaround.
5176          */
5177         I915_WRITE(GEN6_UCGCTL2,
5178                    GEN6_RCZUNIT_CLOCK_GATE_DISABLE |
5179                    GEN6_RCCUNIT_CLOCK_GATE_DISABLE);
5180
5181         /* This is required by WaCatErrorRejectionIssue:ivb */
5182         I915_WRITE(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
5183                         I915_READ(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG) |
5184                         GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
5185
5186         g4x_disable_trickle_feed(dev);
5187
5188         /* WaVSRefCountFullforceMissDisable:ivb */
5189         gen7_setup_fixed_func_scheduler(dev_priv);
5190
5191         /* WaDisable4x2SubspanOptimization:ivb */
5192         I915_WRITE(CACHE_MODE_1,
5193                    _MASKED_BIT_ENABLE(PIXEL_SUBSPAN_COLLECT_OPT_DISABLE));
5194
5195         snpcr = I915_READ(GEN6_MBCUNIT_SNPCR);
5196         snpcr &= ~GEN6_MBC_SNPCR_MASK;
5197         snpcr |= GEN6_MBC_SNPCR_MED;
5198         I915_WRITE(GEN6_MBCUNIT_SNPCR, snpcr);
5199
5200         if (!HAS_PCH_NOP(dev))
5201                 cpt_init_clock_gating(dev);
5202
5203         gen6_check_mch_setup(dev);
5204 }
5205
5206 static void valleyview_init_clock_gating(struct drm_device *dev)
5207 {
5208         struct drm_i915_private *dev_priv = dev->dev_private;
5209
5210         I915_WRITE(DSPCLK_GATE_D, VRHUNIT_CLOCK_GATE_DISABLE);
5211
5212         /* WaDisableEarlyCull:vlv */
5213         I915_WRITE(_3D_CHICKEN3,
5214                    _MASKED_BIT_ENABLE(_3D_CHICKEN_SF_DISABLE_OBJEND_CULL));
5215
5216         /* WaDisableBackToBackFlipFix:vlv */
5217         I915_WRITE(IVB_CHICKEN3,
5218                    CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE |
5219                    CHICKEN3_DGMG_DONE_FIX_DISABLE);
5220
5221         /* WaDisablePSDDualDispatchEnable:vlv */
5222         I915_WRITE(GEN7_HALF_SLICE_CHICKEN1,
5223                    _MASKED_BIT_ENABLE(GEN7_MAX_PS_THREAD_DEP |
5224                                       GEN7_PSD_SINGLE_PORT_DISPATCH_ENABLE));
5225
5226         /* Apply the WaDisableRHWOOptimizationForRenderHang:vlv workaround. */
5227         I915_WRITE(GEN7_COMMON_SLICE_CHICKEN1,
5228                    GEN7_CSC1_RHWO_OPT_DISABLE_IN_RCC);
5229
5230         /* WaApplyL3ControlAndL3ChickenMode:vlv */
5231         I915_WRITE(GEN7_L3CNTLREG1, I915_READ(GEN7_L3CNTLREG1) | GEN7_L3AGDIS);
5232         I915_WRITE(GEN7_L3_CHICKEN_MODE_REGISTER, GEN7_WA_L3_CHICKEN_MODE);
5233
5234         /* WaForceL3Serialization:vlv */
5235         I915_WRITE(GEN7_L3SQCREG4, I915_READ(GEN7_L3SQCREG4) &
5236                    ~L3SQ_URB_READ_CAM_MATCH_DISABLE);
5237
5238         /* WaDisableDopClockGating:vlv */
5239         I915_WRITE(GEN7_ROW_CHICKEN2,
5240                    _MASKED_BIT_ENABLE(DOP_CLOCK_GATING_DISABLE));
5241
5242         /* This is required by WaCatErrorRejectionIssue:vlv */
5243         I915_WRITE(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
5244                    I915_READ(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG) |
5245                    GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
5246
5247         /* According to the BSpec vol1g, bit 12 (RCPBUNIT) clock
5248          * gating disable must be set.  Failure to set it results in
5249          * flickering pixels due to Z write ordering failures after
5250          * some amount of runtime in the Mesa "fire" demo, and Unigine
5251          * Sanctuary and Tropics, and apparently anything else with
5252          * alpha test or pixel discard.
5253          *
5254          * According to the spec, bit 11 (RCCUNIT) must also be set,
5255          * but we didn't debug actual testcases to find it out.
5256          *
5257          * According to the spec, bit 13 (RCZUNIT) must be set on IVB.
5258          * This implements the WaDisableRCZUnitClockGating:vlv workaround.
5259          *
5260          * Also apply WaDisableVDSUnitClockGating:vlv and
5261          * WaDisableRCPBUnitClockGating:vlv.
5262          */
5263         I915_WRITE(GEN6_UCGCTL2,
5264                    GEN7_VDSUNIT_CLOCK_GATE_DISABLE |
5265                    GEN7_TDLUNIT_CLOCK_GATE_DISABLE |
5266                    GEN6_RCZUNIT_CLOCK_GATE_DISABLE |
5267                    GEN6_RCPBUNIT_CLOCK_GATE_DISABLE |
5268                    GEN6_RCCUNIT_CLOCK_GATE_DISABLE);
5269
5270         I915_WRITE(GEN7_UCGCTL4, GEN7_L3BANK2X_CLOCK_GATE_DISABLE);
5271
5272         I915_WRITE(MI_ARB_VLV, MI_ARB_DISPLAY_TRICKLE_FEED_DISABLE);
5273
5274         I915_WRITE(CACHE_MODE_1,
5275                    _MASKED_BIT_ENABLE(PIXEL_SUBSPAN_COLLECT_OPT_DISABLE));
5276
5277         /*
5278          * WaDisableVLVClockGating_VBIIssue:vlv
5279          * Disable clock gating on th GCFG unit to prevent a delay
5280          * in the reporting of vblank events.
5281          */
5282         I915_WRITE(VLV_GUNIT_CLOCK_GATE, 0xffffffff);
5283
5284         /* Conservative clock gating settings for now */
5285         I915_WRITE(0x9400, 0xffffffff);
5286         I915_WRITE(0x9404, 0xffffffff);
5287         I915_WRITE(0x9408, 0xffffffff);
5288         I915_WRITE(0x940c, 0xffffffff);
5289         I915_WRITE(0x9410, 0xffffffff);
5290         I915_WRITE(0x9414, 0xffffffff);
5291         I915_WRITE(0x9418, 0xffffffff);
5292 }
5293
5294 static void g4x_init_clock_gating(struct drm_device *dev)
5295 {
5296         struct drm_i915_private *dev_priv = dev->dev_private;
5297         uint32_t dspclk_gate;
5298
5299         I915_WRITE(RENCLK_GATE_D1, 0);
5300         I915_WRITE(RENCLK_GATE_D2, VF_UNIT_CLOCK_GATE_DISABLE |
5301                    GS_UNIT_CLOCK_GATE_DISABLE |
5302                    CL_UNIT_CLOCK_GATE_DISABLE);
5303         I915_WRITE(RAMCLK_GATE_D, 0);
5304         dspclk_gate = VRHUNIT_CLOCK_GATE_DISABLE |
5305                 OVRUNIT_CLOCK_GATE_DISABLE |
5306                 OVCUNIT_CLOCK_GATE_DISABLE;
5307         if (IS_GM45(dev))
5308                 dspclk_gate |= DSSUNIT_CLOCK_GATE_DISABLE;
5309         I915_WRITE(DSPCLK_GATE_D, dspclk_gate);
5310
5311         /* WaDisableRenderCachePipelinedFlush */
5312         I915_WRITE(CACHE_MODE_0,
5313                    _MASKED_BIT_ENABLE(CM0_PIPELINED_RENDER_FLUSH_DISABLE));
5314
5315         g4x_disable_trickle_feed(dev);
5316 }
5317
5318 static void crestline_init_clock_gating(struct drm_device *dev)
5319 {
5320         struct drm_i915_private *dev_priv = dev->dev_private;
5321
5322         I915_WRITE(RENCLK_GATE_D1, I965_RCC_CLOCK_GATE_DISABLE);
5323         I915_WRITE(RENCLK_GATE_D2, 0);
5324         I915_WRITE(DSPCLK_GATE_D, 0);
5325         I915_WRITE(RAMCLK_GATE_D, 0);
5326         I915_WRITE16(DEUC, 0);
5327         I915_WRITE(MI_ARB_STATE,
5328                    _MASKED_BIT_ENABLE(MI_ARB_DISPLAY_TRICKLE_FEED_DISABLE));
5329 }
5330
5331 static void broadwater_init_clock_gating(struct drm_device *dev)
5332 {
5333         struct drm_i915_private *dev_priv = dev->dev_private;
5334
5335         I915_WRITE(RENCLK_GATE_D1, I965_RCZ_CLOCK_GATE_DISABLE |
5336                    I965_RCC_CLOCK_GATE_DISABLE |
5337                    I965_RCPB_CLOCK_GATE_DISABLE |
5338                    I965_ISC_CLOCK_GATE_DISABLE |
5339                    I965_FBC_CLOCK_GATE_DISABLE);
5340         I915_WRITE(RENCLK_GATE_D2, 0);
5341         I915_WRITE(MI_ARB_STATE,
5342                    _MASKED_BIT_ENABLE(MI_ARB_DISPLAY_TRICKLE_FEED_DISABLE));
5343 }
5344
5345 static void gen3_init_clock_gating(struct drm_device *dev)
5346 {
5347         struct drm_i915_private *dev_priv = dev->dev_private;
5348         u32 dstate = I915_READ(D_STATE);
5349
5350         dstate |= DSTATE_PLL_D3_OFF | DSTATE_GFX_CLOCK_GATING |
5351                 DSTATE_DOT_CLOCK_GATING;
5352         I915_WRITE(D_STATE, dstate);
5353
5354         if (IS_PINEVIEW(dev))
5355                 I915_WRITE(ECOSKPD, _MASKED_BIT_ENABLE(ECO_GATING_CX_ONLY));
5356
5357         /* IIR "flip pending" means done if this bit is set */
5358         I915_WRITE(ECOSKPD, _MASKED_BIT_DISABLE(ECO_FLIP_DONE));
5359 }
5360
5361 static void i85x_init_clock_gating(struct drm_device *dev)
5362 {
5363         struct drm_i915_private *dev_priv = dev->dev_private;
5364
5365         I915_WRITE(RENCLK_GATE_D1, SV_CLOCK_GATE_DISABLE);
5366 }
5367
5368 static void i830_init_clock_gating(struct drm_device *dev)
5369 {
5370         struct drm_i915_private *dev_priv = dev->dev_private;
5371
5372         I915_WRITE(DSPCLK_GATE_D, OVRUNIT_CLOCK_GATE_DISABLE);
5373 }
5374
5375 void intel_init_clock_gating(struct drm_device *dev)
5376 {
5377         struct drm_i915_private *dev_priv = dev->dev_private;
5378
5379         dev_priv->display.init_clock_gating(dev);
5380 }
5381
5382 void intel_suspend_hw(struct drm_device *dev)
5383 {
5384         if (HAS_PCH_LPT(dev))
5385                 lpt_suspend_hw(dev);
5386 }
5387
5388 /**
5389  * We should only use the power well if we explicitly asked the hardware to
5390  * enable it, so check if it's enabled and also check if we've requested it to
5391  * be enabled.
5392  */
5393 bool intel_display_power_enabled(struct drm_device *dev,
5394                                  enum intel_display_power_domain domain)
5395 {
5396         struct drm_i915_private *dev_priv = dev->dev_private;
5397
5398         if (!HAS_POWER_WELL(dev))
5399                 return true;
5400
5401         switch (domain) {
5402         case POWER_DOMAIN_PIPE_A:
5403         case POWER_DOMAIN_TRANSCODER_EDP:
5404                 return true;
5405         case POWER_DOMAIN_VGA:
5406         case POWER_DOMAIN_PIPE_B:
5407         case POWER_DOMAIN_PIPE_C:
5408         case POWER_DOMAIN_PIPE_A_PANEL_FITTER:
5409         case POWER_DOMAIN_PIPE_B_PANEL_FITTER:
5410         case POWER_DOMAIN_PIPE_C_PANEL_FITTER:
5411         case POWER_DOMAIN_TRANSCODER_A:
5412         case POWER_DOMAIN_TRANSCODER_B:
5413         case POWER_DOMAIN_TRANSCODER_C:
5414                 return I915_READ(HSW_PWR_WELL_DRIVER) ==
5415                      (HSW_PWR_WELL_ENABLE_REQUEST | HSW_PWR_WELL_STATE_ENABLED);
5416         default:
5417                 BUG();
5418         }
5419 }
5420
5421 static void __intel_set_power_well(struct drm_device *dev, bool enable)
5422 {
5423         struct drm_i915_private *dev_priv = dev->dev_private;
5424         bool is_enabled, enable_requested;
5425         uint32_t tmp;
5426
5427         tmp = I915_READ(HSW_PWR_WELL_DRIVER);
5428         is_enabled = tmp & HSW_PWR_WELL_STATE_ENABLED;
5429         enable_requested = tmp & HSW_PWR_WELL_ENABLE_REQUEST;
5430
5431         if (enable) {
5432                 if (!enable_requested)
5433                         I915_WRITE(HSW_PWR_WELL_DRIVER,
5434                                    HSW_PWR_WELL_ENABLE_REQUEST);
5435
5436                 if (!is_enabled) {
5437                         DRM_DEBUG_KMS("Enabling power well\n");
5438                         if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) &
5439                                       HSW_PWR_WELL_STATE_ENABLED), 20))
5440                                 DRM_ERROR("Timeout enabling power well\n");
5441                 }
5442         } else {
5443                 if (enable_requested) {
5444                         unsigned long irqflags;
5445                         enum pipe p;
5446
5447                         I915_WRITE(HSW_PWR_WELL_DRIVER, 0);
5448                         POSTING_READ(HSW_PWR_WELL_DRIVER);
5449                         DRM_DEBUG_KMS("Requesting to disable the power well\n");
5450
5451                         /*
5452                          * After this, the registers on the pipes that are part
5453                          * of the power well will become zero, so we have to
5454                          * adjust our counters according to that.
5455                          *
5456                          * FIXME: Should we do this in general in
5457                          * drm_vblank_post_modeset?
5458                          */
5459                         spin_lock_irqsave(&dev->vbl_lock, irqflags);
5460                         for_each_pipe(p)
5461                                 if (p != PIPE_A)
5462                                         dev->vblank[p].last = 0;
5463                         spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
5464                 }
5465         }
5466 }
5467
5468 static void __intel_power_well_get(struct i915_power_well *power_well)
5469 {
5470         if (!power_well->count++)
5471                 __intel_set_power_well(power_well->device, true);
5472 }
5473
5474 static void __intel_power_well_put(struct i915_power_well *power_well)
5475 {
5476         WARN_ON(!power_well->count);
5477         if (!--power_well->count)
5478                 __intel_set_power_well(power_well->device, false);
5479 }
5480
5481 void intel_display_power_get(struct drm_device *dev,
5482                              enum intel_display_power_domain domain)
5483 {
5484         struct drm_i915_private *dev_priv = dev->dev_private;
5485         struct i915_power_well *power_well = &dev_priv->power_well;
5486
5487         if (!HAS_POWER_WELL(dev))
5488                 return;
5489
5490         switch (domain) {
5491         case POWER_DOMAIN_PIPE_A:
5492         case POWER_DOMAIN_TRANSCODER_EDP:
5493                 return;
5494         case POWER_DOMAIN_VGA:
5495         case POWER_DOMAIN_PIPE_B:
5496         case POWER_DOMAIN_PIPE_C:
5497         case POWER_DOMAIN_PIPE_A_PANEL_FITTER:
5498         case POWER_DOMAIN_PIPE_B_PANEL_FITTER:
5499         case POWER_DOMAIN_PIPE_C_PANEL_FITTER:
5500         case POWER_DOMAIN_TRANSCODER_A:
5501         case POWER_DOMAIN_TRANSCODER_B:
5502         case POWER_DOMAIN_TRANSCODER_C:
5503                 spin_lock_irq(&power_well->lock);
5504                 __intel_power_well_get(power_well);
5505                 spin_unlock_irq(&power_well->lock);
5506                 return;
5507         default:
5508                 BUG();
5509         }
5510 }
5511
5512 void intel_display_power_put(struct drm_device *dev,
5513                              enum intel_display_power_domain domain)
5514 {
5515         struct drm_i915_private *dev_priv = dev->dev_private;
5516         struct i915_power_well *power_well = &dev_priv->power_well;
5517
5518         if (!HAS_POWER_WELL(dev))
5519                 return;
5520
5521         switch (domain) {
5522         case POWER_DOMAIN_PIPE_A:
5523         case POWER_DOMAIN_TRANSCODER_EDP:
5524                 return;
5525         case POWER_DOMAIN_VGA:
5526         case POWER_DOMAIN_PIPE_B:
5527         case POWER_DOMAIN_PIPE_C:
5528         case POWER_DOMAIN_PIPE_A_PANEL_FITTER:
5529         case POWER_DOMAIN_PIPE_B_PANEL_FITTER:
5530         case POWER_DOMAIN_PIPE_C_PANEL_FITTER:
5531         case POWER_DOMAIN_TRANSCODER_A:
5532         case POWER_DOMAIN_TRANSCODER_B:
5533         case POWER_DOMAIN_TRANSCODER_C:
5534                 spin_lock_irq(&power_well->lock);
5535                 __intel_power_well_put(power_well);
5536                 spin_unlock_irq(&power_well->lock);
5537                 return;
5538         default:
5539                 BUG();
5540         }
5541 }
5542
5543 static struct i915_power_well *hsw_pwr;
5544
5545 /* Display audio driver power well request */
5546 void i915_request_power_well(void)
5547 {
5548         if (WARN_ON(!hsw_pwr))
5549                 return;
5550
5551         spin_lock_irq(&hsw_pwr->lock);
5552         __intel_power_well_get(hsw_pwr);
5553         spin_unlock_irq(&hsw_pwr->lock);
5554 }
5555 EXPORT_SYMBOL_GPL(i915_request_power_well);
5556
5557 /* Display audio driver power well release */
5558 void i915_release_power_well(void)
5559 {
5560         if (WARN_ON(!hsw_pwr))
5561                 return;
5562
5563         spin_lock_irq(&hsw_pwr->lock);
5564         __intel_power_well_put(hsw_pwr);
5565         spin_unlock_irq(&hsw_pwr->lock);
5566 }
5567 EXPORT_SYMBOL_GPL(i915_release_power_well);
5568
5569 int i915_init_power_well(struct drm_device *dev)
5570 {
5571         struct drm_i915_private *dev_priv = dev->dev_private;
5572
5573         hsw_pwr = &dev_priv->power_well;
5574
5575         hsw_pwr->device = dev;
5576         spin_lock_init(&hsw_pwr->lock);
5577         hsw_pwr->count = 0;
5578
5579         return 0;
5580 }
5581
5582 void i915_remove_power_well(struct drm_device *dev)
5583 {
5584         hsw_pwr = NULL;
5585 }
5586
5587 void intel_set_power_well(struct drm_device *dev, bool enable)
5588 {
5589         struct drm_i915_private *dev_priv = dev->dev_private;
5590         struct i915_power_well *power_well = &dev_priv->power_well;
5591
5592         if (!HAS_POWER_WELL(dev))
5593                 return;
5594
5595         if (!i915_disable_power_well && !enable)
5596                 return;
5597
5598         spin_lock_irq(&power_well->lock);
5599
5600         /*
5601          * This function will only ever contribute one
5602          * to the power well reference count. i915_request
5603          * is what tracks whether we have or have not
5604          * added the one to the reference count.
5605          */
5606         if (power_well->i915_request == enable)
5607                 goto out;
5608
5609         power_well->i915_request = enable;
5610
5611         if (enable)
5612                 __intel_power_well_get(power_well);
5613         else
5614                 __intel_power_well_put(power_well);
5615
5616  out:
5617         spin_unlock_irq(&power_well->lock);
5618 }
5619
5620 static void intel_resume_power_well(struct drm_device *dev)
5621 {
5622         struct drm_i915_private *dev_priv = dev->dev_private;
5623         struct i915_power_well *power_well = &dev_priv->power_well;
5624
5625         if (!HAS_POWER_WELL(dev))
5626                 return;
5627
5628         spin_lock_irq(&power_well->lock);
5629         __intel_set_power_well(dev, power_well->count > 0);
5630         spin_unlock_irq(&power_well->lock);
5631 }
5632
5633 /*
5634  * Starting with Haswell, we have a "Power Down Well" that can be turned off
5635  * when not needed anymore. We have 4 registers that can request the power well
5636  * to be enabled, and it will only be disabled if none of the registers is
5637  * requesting it to be enabled.
5638  */
5639 void intel_init_power_well(struct drm_device *dev)
5640 {
5641         struct drm_i915_private *dev_priv = dev->dev_private;
5642
5643         if (!HAS_POWER_WELL(dev))
5644                 return;
5645
5646         /* For now, we need the power well to be always enabled. */
5647         intel_set_power_well(dev, true);
5648         intel_resume_power_well(dev);
5649
5650         /* We're taking over the BIOS, so clear any requests made by it since
5651          * the driver is in charge now. */
5652         if (I915_READ(HSW_PWR_WELL_BIOS) & HSW_PWR_WELL_ENABLE_REQUEST)
5653                 I915_WRITE(HSW_PWR_WELL_BIOS, 0);
5654 }
5655
5656 /* Disables PC8 so we can use the GMBUS and DP AUX interrupts. */
5657 void intel_aux_display_runtime_get(struct drm_i915_private *dev_priv)
5658 {
5659         hsw_disable_package_c8(dev_priv);
5660 }
5661
5662 void intel_aux_display_runtime_put(struct drm_i915_private *dev_priv)
5663 {
5664         hsw_enable_package_c8(dev_priv);
5665 }
5666
5667 /* Set up chip specific power management-related functions */
5668 void intel_init_pm(struct drm_device *dev)
5669 {
5670         struct drm_i915_private *dev_priv = dev->dev_private;
5671
5672         if (I915_HAS_FBC(dev)) {
5673                 if (HAS_PCH_SPLIT(dev)) {
5674                         dev_priv->display.fbc_enabled = ironlake_fbc_enabled;
5675                         if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
5676                                 dev_priv->display.enable_fbc =
5677                                         gen7_enable_fbc;
5678                         else
5679                                 dev_priv->display.enable_fbc =
5680                                         ironlake_enable_fbc;
5681                         dev_priv->display.disable_fbc = ironlake_disable_fbc;
5682                 } else if (IS_GM45(dev)) {
5683                         dev_priv->display.fbc_enabled = g4x_fbc_enabled;
5684                         dev_priv->display.enable_fbc = g4x_enable_fbc;
5685                         dev_priv->display.disable_fbc = g4x_disable_fbc;
5686                 } else if (IS_CRESTLINE(dev)) {
5687                         dev_priv->display.fbc_enabled = i8xx_fbc_enabled;
5688                         dev_priv->display.enable_fbc = i8xx_enable_fbc;
5689                         dev_priv->display.disable_fbc = i8xx_disable_fbc;
5690                 }
5691                 /* 855GM needs testing */
5692         }
5693
5694         /* For cxsr */
5695         if (IS_PINEVIEW(dev))
5696                 i915_pineview_get_mem_freq(dev);
5697         else if (IS_GEN5(dev))
5698                 i915_ironlake_get_mem_freq(dev);
5699
5700         /* For FIFO watermark updates */
5701         if (HAS_PCH_SPLIT(dev)) {
5702                 intel_setup_wm_latency(dev);
5703
5704                 if (IS_GEN5(dev)) {
5705                         if (dev_priv->wm.pri_latency[1] &&
5706                             dev_priv->wm.spr_latency[1] &&
5707                             dev_priv->wm.cur_latency[1])
5708                                 dev_priv->display.update_wm = ironlake_update_wm;
5709                         else {
5710                                 DRM_DEBUG_KMS("Failed to get proper latency. "
5711                                               "Disable CxSR\n");
5712                                 dev_priv->display.update_wm = NULL;
5713                         }
5714                         dev_priv->display.init_clock_gating = ironlake_init_clock_gating;
5715                 } else if (IS_GEN6(dev)) {
5716                         if (dev_priv->wm.pri_latency[0] &&
5717                             dev_priv->wm.spr_latency[0] &&
5718                             dev_priv->wm.cur_latency[0]) {
5719                                 dev_priv->display.update_wm = sandybridge_update_wm;
5720                                 dev_priv->display.update_sprite_wm = sandybridge_update_sprite_wm;
5721                         } else {
5722                                 DRM_DEBUG_KMS("Failed to read display plane latency. "
5723                                               "Disable CxSR\n");
5724                                 dev_priv->display.update_wm = NULL;
5725                         }
5726                         dev_priv->display.init_clock_gating = gen6_init_clock_gating;
5727                 } else if (IS_IVYBRIDGE(dev)) {
5728                         if (dev_priv->wm.pri_latency[0] &&
5729                             dev_priv->wm.spr_latency[0] &&
5730                             dev_priv->wm.cur_latency[0]) {
5731                                 dev_priv->display.update_wm = ivybridge_update_wm;
5732                                 dev_priv->display.update_sprite_wm = sandybridge_update_sprite_wm;
5733                         } else {
5734                                 DRM_DEBUG_KMS("Failed to read display plane latency. "
5735                                               "Disable CxSR\n");
5736                                 dev_priv->display.update_wm = NULL;
5737                         }
5738                         dev_priv->display.init_clock_gating = ivybridge_init_clock_gating;
5739                 } else if (IS_HASWELL(dev)) {
5740                         if (dev_priv->wm.pri_latency[0] &&
5741                             dev_priv->wm.spr_latency[0] &&
5742                             dev_priv->wm.cur_latency[0]) {
5743                                 dev_priv->display.update_wm = haswell_update_wm;
5744                                 dev_priv->display.update_sprite_wm =
5745                                         haswell_update_sprite_wm;
5746                         } else {
5747                                 DRM_DEBUG_KMS("Failed to read display plane latency. "
5748                                               "Disable CxSR\n");
5749                                 dev_priv->display.update_wm = NULL;
5750                         }
5751                         dev_priv->display.init_clock_gating = haswell_init_clock_gating;
5752                 } else
5753                         dev_priv->display.update_wm = NULL;
5754         } else if (IS_VALLEYVIEW(dev)) {
5755                 dev_priv->display.update_wm = valleyview_update_wm;
5756                 dev_priv->display.init_clock_gating =
5757                         valleyview_init_clock_gating;
5758         } else if (IS_PINEVIEW(dev)) {
5759                 if (!intel_get_cxsr_latency(IS_PINEVIEW_G(dev),
5760                                             dev_priv->is_ddr3,
5761                                             dev_priv->fsb_freq,
5762                                             dev_priv->mem_freq)) {
5763                         DRM_INFO("failed to find known CxSR latency "
5764                                  "(found ddr%s fsb freq %d, mem freq %d), "
5765                                  "disabling CxSR\n",
5766                                  (dev_priv->is_ddr3 == 1) ? "3" : "2",
5767                                  dev_priv->fsb_freq, dev_priv->mem_freq);
5768                         /* Disable CxSR and never update its watermark again */
5769                         pineview_disable_cxsr(dev);
5770                         dev_priv->display.update_wm = NULL;
5771                 } else
5772                         dev_priv->display.update_wm = pineview_update_wm;
5773                 dev_priv->display.init_clock_gating = gen3_init_clock_gating;
5774         } else if (IS_G4X(dev)) {
5775                 dev_priv->display.update_wm = g4x_update_wm;
5776                 dev_priv->display.init_clock_gating = g4x_init_clock_gating;
5777         } else if (IS_GEN4(dev)) {
5778                 dev_priv->display.update_wm = i965_update_wm;
5779                 if (IS_CRESTLINE(dev))
5780                         dev_priv->display.init_clock_gating = crestline_init_clock_gating;
5781                 else if (IS_BROADWATER(dev))
5782                         dev_priv->display.init_clock_gating = broadwater_init_clock_gating;
5783         } else if (IS_GEN3(dev)) {
5784                 dev_priv->display.update_wm = i9xx_update_wm;
5785                 dev_priv->display.get_fifo_size = i9xx_get_fifo_size;
5786                 dev_priv->display.init_clock_gating = gen3_init_clock_gating;
5787         } else if (IS_I865G(dev)) {
5788                 dev_priv->display.update_wm = i830_update_wm;
5789                 dev_priv->display.init_clock_gating = i85x_init_clock_gating;
5790                 dev_priv->display.get_fifo_size = i830_get_fifo_size;
5791         } else if (IS_I85X(dev)) {
5792                 dev_priv->display.update_wm = i9xx_update_wm;
5793                 dev_priv->display.get_fifo_size = i85x_get_fifo_size;
5794                 dev_priv->display.init_clock_gating = i85x_init_clock_gating;
5795         } else {
5796                 dev_priv->display.update_wm = i830_update_wm;
5797                 dev_priv->display.init_clock_gating = i830_init_clock_gating;
5798                 if (IS_845G(dev))
5799                         dev_priv->display.get_fifo_size = i845_get_fifo_size;
5800                 else
5801                         dev_priv->display.get_fifo_size = i830_get_fifo_size;
5802         }
5803 }
5804
5805 int sandybridge_pcode_read(struct drm_i915_private *dev_priv, u8 mbox, u32 *val)
5806 {
5807         WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
5808
5809         if (I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) {
5810                 DRM_DEBUG_DRIVER("warning: pcode (read) mailbox access failed\n");
5811                 return -EAGAIN;
5812         }
5813
5814         I915_WRITE(GEN6_PCODE_DATA, *val);
5815         I915_WRITE(GEN6_PCODE_MAILBOX, GEN6_PCODE_READY | mbox);
5816
5817         if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) == 0,
5818                      500)) {
5819                 DRM_ERROR("timeout waiting for pcode read (%d) to finish\n", mbox);
5820                 return -ETIMEDOUT;
5821         }
5822
5823         *val = I915_READ(GEN6_PCODE_DATA);
5824         I915_WRITE(GEN6_PCODE_DATA, 0);
5825
5826         return 0;
5827 }
5828
5829 int sandybridge_pcode_write(struct drm_i915_private *dev_priv, u8 mbox, u32 val)
5830 {
5831         WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
5832
5833         if (I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) {
5834                 DRM_DEBUG_DRIVER("warning: pcode (write) mailbox access failed\n");
5835                 return -EAGAIN;
5836         }
5837
5838         I915_WRITE(GEN6_PCODE_DATA, val);
5839         I915_WRITE(GEN6_PCODE_MAILBOX, GEN6_PCODE_READY | mbox);
5840
5841         if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) == 0,
5842                      500)) {
5843                 DRM_ERROR("timeout waiting for pcode write (%d) to finish\n", mbox);
5844                 return -ETIMEDOUT;
5845         }
5846
5847         I915_WRITE(GEN6_PCODE_DATA, 0);
5848
5849         return 0;
5850 }
5851
5852 int vlv_gpu_freq(int ddr_freq, int val)
5853 {
5854         int mult, base;
5855
5856         switch (ddr_freq) {
5857         case 800:
5858                 mult = 20;
5859                 base = 120;
5860                 break;
5861         case 1066:
5862                 mult = 22;
5863                 base = 133;
5864                 break;
5865         case 1333:
5866                 mult = 21;
5867                 base = 125;
5868                 break;
5869         default:
5870                 return -1;
5871         }
5872
5873         return ((val - 0xbd) * mult) + base;
5874 }
5875
5876 int vlv_freq_opcode(int ddr_freq, int val)
5877 {
5878         int mult, base;
5879
5880         switch (ddr_freq) {
5881         case 800:
5882                 mult = 20;
5883                 base = 120;
5884                 break;
5885         case 1066:
5886                 mult = 22;
5887                 base = 133;
5888                 break;
5889         case 1333:
5890                 mult = 21;
5891                 base = 125;
5892                 break;
5893         default:
5894                 return -1;
5895         }
5896
5897         val /= mult;
5898         val -= base / mult;
5899         val += 0xbd;
5900
5901         if (val > 0xea)
5902                 val = 0xea;
5903
5904         return val;
5905 }
5906
5907 void intel_pm_init(struct drm_device *dev)
5908 {
5909         struct drm_i915_private *dev_priv = dev->dev_private;
5910
5911         INIT_DELAYED_WORK(&dev_priv->rps.delayed_resume_work,
5912                           intel_gen6_powersave_work);
5913 }
5914